Log In Cart
Log In

Create An Account

Log In Cart
Your Cart Is Empty
Hondata Reflash: 02-04 RSX Type-S-A1
Hondata Reflash: 02-04 RSX Type-S-A2
Hondata Reflash: 02-04 RSX Type-S-A3
Hondata Reflash: 02-04 RSX Type-S-A4
Hondata Reflash: 02-04 RSX Type-S-A5

Hondata Reflash: 02-04 RSX Type-S

Part Number: K20A2

5 out of 55 out of 55 out of 55 out of 55 out of 5 37 customer reviews

Reward Points

It pays to shop with K Series Parts and our reward points program! For every $1.00 you spend you earn reward points.

They are easy to earn, just log in to your account when you check out. If you don't have one it is free and easy to setup.

They are easy to use during check out. Click on the "Have Reward Points?" on the shipping and payment selection page.

Reward Point Program Details

You earn 2 points for every $1.00 that you spend.

100 points equal a $1.00 discount.

Maximum discount per order is 5% of the order total.

There is no minimum order total to redeem points.

Points do not apply to shipping or sales tax.

Points are not redeemable for cash.

The point value per dollar, points earned per purchase, and order minimum are subject to change.

Earn 580 reward points. Learn More


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
CARB Approved: No

Customer Reviews

4.9 out of 5.0 5 out of 55 out of 55 out of 55 out of 55 out of 5

37 Total Reviews

Add Your Review

Most Recent

5.0 out of 5.0 5 out of 55 out of 55 out of 55 out of 55 out of 5

Far more civilized a must

By Chris Guinn on 10/27/2017

Didn't realize how far from optimal the stock calibration was downshifting let off everything about the driving experience improved far easier smoother and more quiet not as hot/cold on/off all or nothing and yeah she's ready for that mustang new redlines like an illicit substance

5.0 out of 5.0 5 out of 55 out of 55 out of 55 out of 55 out of 5

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

By Drew Ottman on 8/22/2017

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.

4.0 out of 5.0 4 out of 54 out of 54 out of 54 out of 54 out of 5


By Mario Cruz on 6/13/2017

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

5.0 out of 5.0 5 out of 55 out of 55 out of 55 out of 55 out of 5

Best bang for your buck!

By Dole Mohamed on 12/24/2015

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.

5.0 out of 5.0 5 out of 55 out of 55 out of 55 out of 55 out of 5

Best $300 I ever spent.

By Nathan K on 5/13/2015

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.

Read All 37 Reviews

Add Your Review