Hondata - K-Pro Version 4 (05-06' RSX)

Hondata - K-Pro Version 4 (05-06' RSX)

Product Type: ECU Modification & EMS
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Product Details



This is a Hondata-modified 2002-2004 RSX ECU and an adapter harness for the 05-06' RSX. Hondata makes hardware modifications to the 2002-2004 ECU to enable it to work with the different sensors and actuators found on the 2005-2006 RSX ECU. After these modifications, the ECU will not function correctly on a 2002-2004 RSX. Hondata only sells adapter harness with the modified ECU.

An unmodified 02-04' ECU with adapter harness (with or without K-Pro) will not work on a 05-06' RSX without the internal ECU modifications performed by Hondata. Compatibility The 05-06' K-Pro is only certified to work in an 05/06' RSX. Engine swaps using an 05-06' RSX engine and gearbox into another chassis are not supported with the 05/06' K-Pro and adapter harness.

The correct method is here: Application Notes An primary oxygen sensor from the 02-04 RSX or 02-05 Civic Si must be used.  The 05-06 RSX O2 sensor will not work. OBD2 must be disabled to eliminate errors generated by the ECU looking for emissions items that the 05-06 RSX does not have.

The speed sensor spins about 100 times faster on the 05/06 RSX gearbox as compared to the 02-04 RSX. Above 65-70 MPH cruise control may not function smoothly and may cancel from time to time. Also see Tech - K20 Transmissions Which Donor ECU can I use? Only the following ECUs can be used. 2002-2004 RSX Type S (PRB A03-A08, PRB-305 ECU). 

Should be used for a Type S 2002-2004 RSX (Base 5 speed) (PND -A0# ECU) Should be used for a Base The stock 2005-2006 ECU part number PRB-A13 through PRB-A16 has a different microprocessor and cannot have a K-Pro installed.

Adapter Harnesses These are the only harnesses that are guaranteed to work with the 05/06 K-Pro. These adapter harnesses are sold only with an 05-06 RSX-K-Pro.Identification: - Blue Wire - Sticker stating 05/06 Adapter (some adapters may not have stickers) - Three white plugs or - Two white plugs and a grey plug (from about June 2007).

If you are are having problems you may have a counterfeit adapter harness.  To verify if you have a genuine adapter harness, contact Hondata with the serial number of your K-Pro. Tuning the 05-06 RSX The 05 ECU was replaced with a jumper harness and 04 ECU with K-Pro and then tuned. In the example below the 05 RSX was equipped with a cold air intake.

The only change was from stock ECU (yellow line) to K-Pro + tuning (blue line). Points of interest VTEC was set at 4600 rpm 18 ft pounds torque gain at 2000 rpm 15 ft pounds gain at 5800 rpm and at 8000 rpm 16 hp peak gain, but 20 hp gain at 5800 and 8000 rpm Comments: This engine responds better to tuning than the K20A2, probably due to the better cams and the fact that the stock ECU runs so rich at the top end.

A race header, with tuning will provide a significant increase in the mid range and top end torque. Cams We have cross referenced the 05 RSX intake and exhaust camshaft part numbers with those available for Japanese ITR.The Japanese part numbers for the ITR intake cams are: 14110-PRC-000 14110-PRC-010 14110-PRC-020 This is because there have been three revisions of the engine.

The US part numbers for the 05 cams are: 14110-PRC-030 (intake) 14120-PRC-030 (exhaust) It is therefore our assumption that the cams in the 05 RSX are the Japanese ITR cams. which have the same lift but more duration than the PRB cams (The 02-04 intake cam part number is: 14110-PRB-020 )

Shipping & Returns

Returns Policy

Our return policy varies between products on whether you can return it or not. We do stand by the policy that ALL POSSIBLE returned products will be charged with a 20% Restocking Fee. NO FULL REFUNDS. If you have any questions about returning your items please contact our reps at 732-638-5268 or email


We stand by our policy of same day shipping on all in stock items if purchased before 4:30 PM (Eastern-Time). If an item is not in stock, you will have an update as to when your item will ship within 24 hours. Below is a map locating where we do our one day shipping to. If you have any questions about shipping make sure to email us at or call our reps today at 732-638-5268.

Lost/Stolen Package

If by any chance, your package that has been delivered by the carrier is lost/stolen, YOU (THE BUYER) are responsible for working with the carrier and us, Tri-State Motorsports to recover your package. You must contact us and the shipping company within 48 hours of delivery for lost/damage claims. You are covered by the basic insurance amount APPROVED by the shipping center. We DO NOT refund or reship product for claims that are denied by the shipping company.

NOTE: Once the products have been shipped, the order CAN NOT be canceled.

Main Shipping Carrier: UPS


Does this product fit my Vehicle?

Please read the Description carefully. We try our best to put vehicle fitment information on all of our products description. If by any chance your vehicle is not listed and you have a question, feel free to ask one of our experts at 1 (844) - 442-8118 . Please have the product SKU ready.

When will this product ship out?

If the product is in-stock and the order is placed before our shipping cut-off time (4:30PM Eastern-Time), your product will ship the same day. If the product is not in stock, you will have an update as to when your item will ship within 24 hours. Click on the 'Shipping & Returns' tab to view the map locating where we do our one day shipping to. If you have any questions about shipping make sure to call our reps today at 1 (844) - 442-8118.

What's the Warranty on this product?

Unless the product is manufactured by Tri-State Motorsports or TSM Race, ALL Warranties go through the Manufacture directly. Please visit their official website and get in contact with them in regards to your warranty. We will supply you with any invoice or tracking information the manufacture asks you for.

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