Hondata Reflash: 2002/2003/2004 RSX Type-S
Part Number: K20A2

Hondata Reflash: 2002/2003/2004 RSX Type-S
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    The K20A2 program advances the ignition, alters the cam timing and optimizes the fuel for a cold air intake headers and exhaust, adding 12-20 ft lb across the rev range.

    This program was tuned specifically for a cold air intake, as they give the best power gains.

    This reflash is not suitable with nitrous due to the aggressive ignition advance.


    You are responsible for paying for and sending your ECU to Hondata. You can send your ECU as fast as you would like and shipping costs normally start at $10.00 for ground and $60.00+ for next day air. We recommend using an express service (2 day or next day) through FedEx or UPS because they have the least amount of delivery problems, provide proper insurance, and have good package tracking. We recommend that you do not use USPS because of delivery issues. You are not sending your ECU to K Series Parts you will be sending it to Hondata directly and we provide all of the instructions on where it needs to be sent once your order is approved.


    After we approve your order we will send you two emails, one email will be a Hondata form and the other email will be instructions for shipping and what items need to be included. Orders submitted by 3:00pm Mountain Standard Time Monday to Friday are normally approved same day. Orders places after 3:00pm MST or on Saturday and Sunday are processed the next business day.

    Hondata normally reflashes ECU's the same day they receive them but they do get busy and it might take an extra business day. We recommend that you plan on a 3 day total turnaround time from the day that Hondata receives your ECU.

    Return Shipping

    Hondata uses K Series Parts FedEx account to next day air the ECU back to you once the reflash has been installed. This means that you do not have to pay for return shipping. Your ECU will arrive by 3:00pm the day after Hondata completes the reflash installation. Hondata does not provide us with a tracking number or notification when they ship the ECU back to you.

    ECU Serial Number

    The serial number is located on the ECU. Hondata has provided instructions on how to remove the ECU.

    International Customers

    K Series Parts cannot sell reflashes to customers outside of the United States per Hondata request. The shipping address must be a US based address.


    02-04 RSX Type S with K20A2 engine ECU part number: PRB A01 through PRB A08


    • 15-20 ft/lb torque increase between 2500-3500 rpm.
    • 12-20 peak wheel hp from a stock RSX depending on the dyno and modifications.
    • Peak torque now at 3200 rpm on an unmodified RSX.
    • Very flat smooth torque curve. 95% of peak torque available from 2500-8000 rpm.
    • Rev limiter optionally raised to 8600 RPM.
    • VTEC point lowered to 5200 rpm for cars with intake systems.
    • Passes Californian smog testing (no measurable difference from stock).
    • Fully dealer compatible - works with all Honda scan tools and equipment.


    Any increase in RPM limit is at your own risk. If you suffer engine damage that is related to excessive revs Honda / Acura will not cover your warranty.

    With regard to aftermarket parts, the law is that warranty coverage cannot be denied simply because such parts are present on the vehicle, or have been used. For more details read the K series FAQ.


    Honda may not cover mechanical damage to the engine under warranty resulting from exceeding the factory red line. Hondata & K Series Parts will not cover any damage as a result of installing this product.


    Brand: Hondata
    Part Number: K20A2

    Vehicle Fitment

    Acura RSX

    36 reviews for Hondata Reflash: 2002/2003/2004 RSX Type-S

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    4.861111111111111 out of 5.0

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    5 out of 55 out of 55 out of 55 out of 55 out of 5

    8/22/2017 by Drew Ottman

    Well worth it, and can upgrade to kpro later? SOLD!

    Definitely helped my 2003 RSX S with CAI,RH,AND EXHAUST. VTEC at 5200 still gives a nice crossover and the throttle response is amazing. I also have a ITR ecu so I will say each have their advantages but other then VTEC they both make the car a MEAN MACHINE; maybe I'll do a dyno comparison one day.

    4 out of 54 out of 54 out of 54 out of 54 out of 5

    6/13/2017 by Mario Cruz


    IT DID NOT LOWER VTEC stayed at 5800rpm. That's what I was looking forward to the most. But I still gave it a 4 star because you can feel the power gain, nothing to crazy though. But yes worth the money! BEFORE: AFTER: 04 RSX Type S 14 Honda Si

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    12/24/2015 by Dole Mohamed

    Best bang for your buck!

    Best bang for your buck! I had the an injen cai before I got the reflash and it basically just made the car sound better. There wasn't a noticeable difference in power. Now the power band is very even and smooth. I don't have to wait till 6k rpms for power. I even spin tires in 1st if I floor it. Definitely worth the money. I also like how they let you pay the difference for Kpro if you want to do more upgrades.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    5/13/2015 by Nathan K

    Best $300 I ever spent.

    I have the reflash along with an aem v2 intake and 8600 limiter. I must say having the power down low makes regular street driving much easier. The car just wants to go once i put my foot down and this is WITHOUT downshifting to gain speed. For those spirited runs the car comes alive more than before stock and wants to keep going until the road runs out. It makes it feel like a much better car and feels like it should have been like this from the start. This is a must have in my opinion for anyone that cant afford kpro yet(like me) or someone that wants some extra power for a stock daily or a full bolt on rsx.. Kseriesparts customer service was extremely helpful and helped sort out whatever issues there were with my order. If you are thinking about buying the reflash definitely get it from Kseries.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    12/4/2014 by Michael


    Worth every penny. The torque is way better, having vtec earlier is nicer than you think, and with the 8600 limiter you essentially go from 2000 rpm of vtec to 3400 rpm of vtec. If you just have intake and exhaust, or even just intake I highly recommend. Also, gained about 1/2 to 1mpg increase.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    8/22/2014 by Johnny Chanthalima


    I ordered this a few months ago, it's definatley worth the money. If you plan on kpro later on get this first until you can save up

    4 out of 54 out of 54 out of 54 out of 54 out of 5

    7/29/2014 by Kynal Kou

    Not what I expected

    I purchased this and got it last Friday. At first, I was hesitant on shipping out my ECU, immobilizer, and key. Who knows what could go wrong. If i lose those, I'm pretty much screwed. My car would be an empty shell sitting duck. I was wronged. It was fast. They shipped it back the next day. Great service, would do business again. Now onto the Reflash. DAMMMM!!! THIS IS CRAZY!!! It pulls harder than before. Although top end, you can't feel the pull anymore. Low and mid range is where you feel it. It's not a dramatic change like the old VTEC dip you feel when VTEC kicks in, everything just blends in. I got only a CAI for engine mods. It's too soon to judge and get an overall feeling as it's only been 3 days of driving with it. However, today when going to work, it really does help as a daily driver, it is no longer an effort to gain speed from a stop, No longer have to rev so high. Is it worth the $600 they charged back then, HELL TO THE NO. At $290, it's reasonable for the gain. In conclusion, best bang for the buck mod. You won't regret it.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    9/11/2013 by Jeremy Merrill

    WOW, do this now!

    Wow, this is by far the best thing I could have ever done to my rsx type s. I already had injen cai, hondata img, dc shorty header, test pipe, tanabe touring medallion exhaust. Which is great. But until I got the reflash, vtec dipped between gears making it incredibly annoying and weak. Now my vtec stays active between gears, my redline is 9k so I can actually stay in vtec forever even shifting at 8500. I was unsure about doing this at first, but I am so glad I did. I feel like the car was 0-60 in 7 seconds and after reflash 0-60 in 5.5 seconds. I unfortunately don't have a dyno to show before or after, I wish I did. But I can say DO THIS NOW! don't even hesitate, and if you plan on doing much more than bolt ons, get KPRO instead! I am very happy where I'm at now. I'm tuned at probably equivalent of street tune on a KPRO , just I cannot modify or change anything, which is fine with me.

    3 out of 53 out of 53 out of 53 out of 53 out of 5

    8/27/2013 by Michael Bingnear

    Not what i expected based on all the reviews

    So i would say that if i had paid the $600 this reflash used to be i would have returned it screaming at hondata that it is garbage, I have a injen cold air and a test pipe and i honestly dont feel much of a difference at all besides the lowered vtec point, i picked up .2 at the track 14.8 down from 14.99 i feel that this reflash is a waste of money, save up and get kpro and then get it dyno tuned for max gains cuz the reflash is nothing big. disappointed.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    8/25/2013 by Pablo Leon

    love it

    this is a must if you own a type-s. sent my ecu out Wednesday afternoon got it back Friday really fast turn around

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    9/27/2012 by Justen

    Well worth the money

    After reading all the reviews I couldn't wait to get mine . Everything I expected. Im only running aem V2 SRI along with The reflash and i can feel the difference in power especially on top end. Very satisfied with this purchase. Thank you crsx for this great product!

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    8/17/2012 by Civlude97

    worth every penny twice over

    sent the ecu out monday with standard shipping (10.6$ from MI to CA) and had to back at my front door thursday.. insane fast shipping and very smooth transaction. Once installed i noticed a HUGE increase in usable power and a very strong overall power band. at first its hard to get used to the elimination of the dramatic vtec dip. In all this was well worth the 300$ shipped i paid and is by far a must for those seeking quick, cheep power and dont plan on building or boosting any time soon. I have a youtube video of the before and after for those interested(youtube name Lilskater519). Cars only other mods are AEM V2 and comptech shift kit.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    5/29/2012 by Matt

    02 RSX Type S Reflash

    Noticeable change in VTEC engagement and low end torque. Love the 8600 redline:). Definitely more fun to drive but isn't worth the 600 it was a couple years ago. With a tune, I'm sure I would feel more of a difference.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    5/12/2012 by Joe

    Worth Every Penny!!

    This Reflash really brings out the true performance of your basic bolt ons. Highly recommend this mod if you don't plan on turbo or supercharger. Couldn't be more happier!! Thanks to Club RSX and Hondata!

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    5/9/2012 by Stoopidstock

    Love it man.

    The product did as it said it would and as all of these other guys said. Best bang for the buck. Really unleashed some of that covered up power from stock. Love it, especially the 8600 rev limiter.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    2/13/2012 by Joseph

    Great bang for the buck!

    This is one of the best mods I have purchased for my car. It entirely changed the powerband, allowing for a lot more torque in any rpm. I feel most of the power during daily driving, as well as up high in the VTEC range. It pulls harder than ever, and the 8600 rev limit is quite addictive! I highly recommend this modification for anybody who wants a great increase in power all throughout the powerband.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    2/7/2012 by Spencer


    I have an 02 Type S with 197k miles, CAI, and a longtube. The first vtec pull after putting my ecu back in left my hands shaking....the difference was unreal. Shipped it out thursday night, got it back monday morning: very impressed! Super smooth transaction!

    4 out of 54 out of 54 out of 54 out of 54 out of 5

    8/10/2011 by A.G.

    Good gains

    Definitely can feel some added power and car runs very smooth. The only reason I did not give it 5 stars is bc its almost too smooth. Gone is the aggressive vtec sound. The extra rpms is nice tho and has no problem reaching it.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    4/7/2011 by Maryan

    Good product, good gains

    The reflash netted a good amount of power for me. See my dyno results thread where I compared the stock ecu with this reflashed one. Overall I got awesome midrange gains and 4-8whp all the way up to redline. Very happy with the results.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    3/24/2011 by Trev


    It's awesome, but already ready already to upgrade to K Pro. So that's the next purchase!

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    3/11/2011 by Josh bauerlein

    Reflash ftw

    This is everything I expected. This is how Honda should have released the type s from the factory. Great for those of you who have light mods and not looking to spend the money on kpro. I have a sri and exhaust and I could not be more satisfied for $290.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    3/8/2011 by EnzoBeneno

    Exactly what they promised!

    For the money, there is no better mod. Quick and easy.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    2/11/2011 by Ryan

    Makes for a better overall drive

    Best bang for the buck! It makes the car souch more fun to drive. If you're looking to get a little more out of your car without laying down too much money, this mods worth it. It's makes the car get up and go so much easier. Much smoother power band.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    12/27/2010 by Vince M

    Great mod for the price

    At first, had the reflash paired w/ a gutted box, hi/dri flow filter and results were pretty good, especially in low/mid RPM as car pulled harder and was easier to drive in daily traffic. Recently swapped out gutted box w/ SRI; low/mid RPM feel the same still, but high end definitely feels smoother and pulls harder. I've read alot of reviews with adjectives like "wow" and "holy #$&!"; while I wouldn't go that far, I am happy w/ the reflash. After having it, I will say that I would NOT have purchased a reflash for 600 bucks though.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    12/19/2010 by ricky

    Thanks Clubrsx, thanks Hondata.

    I'm extremely pleased with the new calibration on my ecm, it not only idles smoother and pulls with more torque at low rpms without hustle , but you can really feel the difference in high rpms, i got a 03 rsx type s with hondata img, cai,dcssrh,custom 2.5 catback and the newly reflash, i pulled on a s2000 with intake and exhaust( same car beat me for like a bus length before) im dont drive my car hard all the time, i love driving slow actually, but now when i do, it puts a big smile on my face. i shipped my box(overnight) on wednesday the 15th at 5:00pm and got it back friday the 17th at noon!, thanks club rsx and thanks hondata for a pleasant transaction.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    10/13/2010 by jon-js

    Very Good

    thank you clubrsx for smooth transaction. The reflash is very good.I like the added torque on the car. very smooth going all the way up on the RPM.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    9/14/2010 by scott

    hondata fast shipping

    Holy Shit!!!!!!!! thats all i gotta say!!!! crsx FTW!!!!!!!!!!!!!!!

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    9/6/2010 by Jackson

    Best bang for bolt-ons

    I have an ep3 with a k20a2 swap and the usual bolt-ons I/H/E. Before the reflash the car felt very rough right before the VTEC crossover and I had to downshift to climb a hill or pass cars on the freeway. After the reflash I have a lower VTEC point and more rpm's to rev to the new 8600 redline. The car feels quiet even when crossing VTEC and driving it is no longer a fight due to the more usable torque curve. The car idles smoother and driving it feels like it should have been this way from the factory. I would simplify it by saying it brings all bolt-ons together

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    8/23/2010 by Abel Correa

    Great buy and great shipping!

    The reflash works great! Power gains are noticeable depending on other add-ons of course. Vtec engagement change is very helpful. The most important part is the shipping service. It arrived right on time very well wrapped and once installed everything turned over perfectly. Great buy if you are on a budget! No more having to rev it too high just to stay in vtec.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    8/18/2010 by Juan Santiago

    More power for the money than any other upgrade.

    My RSX feels like a completely different animal. I live in the city, so the torque gains are a HUGE benefit. I no longer have to hit vtec to get around city streets in a hurry. AS long as you're keeping your RSX N/A, you'll definitely want this upgrade. On a side note, my check engine light came on as soon as I started the car, after receiving the ECU from HONDATA. I can't say for sure that it's related to the reflash, but what are the odds? I'll have the codes checked out to see what the problem is. Either way, it's still worth every penny and more.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    8/11/2010 by mike

    awesome definitely made a difference!

    I was skeptical about the reflash but its awesome. I can probably actually get to at least 150mph now. sixth gear actually does something now. I have pwjdm intake, obx race header, rbc manifold, and rsr exmag exhaust and with the reflash the car pulls hard as hell now. Its a good first step towards getting kpro one day. You can always upgrade at a reduced price. Would definitely recommend reflash!

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    7/7/2010 by Stacy


    made my car run better. overall a good buy, especially for the vtec kicking in at 5200rpm and the rev limiter at 8600rpm.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    2/24/2009 by jason

    best bang for the buck

    imo, reflash is the best performance mod you can make when you're starting out. upgrading to kpro is a great idea after you add on all the bolt ons. worth every penny.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    9/27/2008 by Bobby Ferreira

    ECU Reflash

    Totally transformed the car, felt brand new after the reflash. I have a SRI, Exhaust, Shorty Header with Hi Flo Cat and the car was reaching 70,000 miles when I reflashed it. Best bang for your buck, no problems at all.

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    9/27/2008 by brett


    I was amazed... i didnt notice the vtec kick in in 3rd and all of a sudden i was going like 80. makes the car much smoother and the added torque is really noticeable when just driving around parking lots and such... only complaint is no stickers...:(

    5 out of 55 out of 55 out of 55 out of 55 out of 5

    3/26/2008 by jb

    Great for lightly modified applications.

    This ECU software really opens up the engine to make better power for lightly modified applications. For the price, it will give you more power than any simple bolt on, and when paired with aftermarket intake and exhaust the results will be slightly better. Gains are seen on both the low end and the high end with the improved VTEC window, and the car seems to have no problem handling the increased redline (though hitting the higher rev limiter is not a good idea). The discounted upgrade to K-pro is good for those who plan to upgrade to a more heavily modified setup later on.