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Hondata 05-06 RSX Type S Reflash-A1
Hondata 05-06 RSX Type S Reflash-A2

Hondata 05-06 RSX Type S Reflash

Part Number: K20Z1-05

5 out of 55 out of 55 out of 55 out of 55 out of 5 25 customer reviews

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

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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.

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

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The K20Z1 program advances the ignition, alters the cam timing and optimizes the fuel for better driving and advanced performance. It adds up to 20hp and up to 12 ft/lbs fo torque.

This program works very well with cold air intakes and cat-back exhausts. If you have a race header then you need to use K-pro.

This reflash is not suitable with stock air box, race header, anything other than stock cams, force induction or nitrous.


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.


  • 2005 US RSX Type S with K20Z1 engine - ECU part number PRB-A13
  • 2006 US RSX Type S with K20Z1 engine - ECU part number PRB-A14
  • 2006 US RSX Type S with K20Z1 engine - ECU part number PRB-A15


  • VTEC window from 4900 to 5800 rpm
  • 8600 rpm Rev limit, increased from 8300 rpm
  • Maximum torque gain 12 ft/lbs torque at 6000 rpm
  • Maximum power gain 20 hp at 8000 rpm
  • Peak torque increases by 6 ft-lbs
  • Peak power increases by 8 hp
  • Very wide flat smooth torque curve. 90% of peak torque available from 2200-8000 rpm.
  • 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: K20Z1-05
CARB Approved: No

Vehicle Fitment

Customer Reviews

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

25 Total Reviews

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Most Recent

3.0 out of 5.0 3 out of 53 out of 53 out of 53 out of 53 out of 5

All in all, okay

By Kazumi Nomura on 6/30/2012

This product is okay. It gives moderate gains. Engine sounds a little different, sounds a little deeper. It does make your car and acceleration smoother. I like the product, it's a nice gain, improvement. You really have to look for the difference, it's not easily apparant, noticable. Hopefully should be nice with some other improvements I plan to do.

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

Reflash fun

By Dave on 4/22/2012

2006 Type-S. Injen Ram air, Borla exhaust, and now the relash. Holy smokes. What a difference. Must have if you have no plans to turbo or supercharge. No need for me with these mods.

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

Dee Shyytt

By Bthet on 4/17/2012

I have an 06 with i/h/e and i know raceheaders are not recommended but ohhh welll :). Big difference in everyday driving which makes it more enjoyable and power gains are noticeable. Good upgrade for the price. Shipped it out monday afternoon got it back wednesday. Cant complain.

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

Feels like it grew to a 2.2L

By IronGumby on 3/25/2012

I cannot be happier with this mod!! It feels primed and ready for action at all times now. The new-found torque down low makes you wonder how you ever drove it before; it's hard to make it bog. VTEC now is enjoyed from 4900 on up and just really shines and makes one proud to have a K-motor. You can feel it surge a second time as you surpass 7000rpm, too! The higher revs are foreign to the ear and I feel like it finally broke my motor in. This is all with only the Icebox intake so I can only wonder what adding the CRSX header will do!

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

Totally Worth It

By Daniel Koffer on 2/13/2012

I got the reflash a few months ago because I didn't, and still dont plan to do anymore then basic bolt-ons. I already had a cai, and with the reflash, it is a night and day difference over stock. Worth every penny.

Read All 25 Reviews

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