Hondata 02-04 Honda Civic Si ECU Reflash
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The 2002-2004 Honda Civic Si K20A3-Si Hondata reflash program advances the ignition, alters the cam timing and optimizes the fuel for a cold air intake, adding 4-9 ft lb across the rev range.
- 10-12 Peak HP gain depending on the dyno and modifications
- 4-9 ft lb torque across the rev range
- Power peak raised 400 rpm from 6300 rpm to 6700 rpm (higher with headers)
- Rev limiter raised to 7700 rpm.
- Fully dealer compatible - works with all Honda scan tools and equipment.
- 0-60 mph times improved by 1 second.
- This tune is for 91 octane pump gas
- Only ECU's with part number 37820-PNF-A01 to 37820-PNF-A12 are able to be reflashed.
- This program was tuned specifically for a cold air intake
After you order you will receive two emails; one with full instructions on where and how to send your ECU to Hondata and another with the form that you need to sign and include with your ECU.
You are required to send your ECU to Hondata for this service. This product is final sale.
2002 Honda Civic Si Hatchback 2003 Honda Civic Si Hatchback 2004 Honda Civic Si Hatchback
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Dustin | October 29th, 2019
KSERIESParts made the process very simple. Very Fast turn around time. The Reflash is definitely worth the money. Higher revs, Smoother power from 0 to redline. Don't hesitate! Just Get it!!!
brett | April 17th, 2014
OKAY. soo I got my reflashed ecu from hondata and I couldn't be happier. filled up the tank from empty with 93 (91 is cool too; we have 93 in NY) hooked everything up and let it idle for 10 minutes. at first it was making some noise but it went away once the ecu learned the engine again.. first impressions: -the low end is greatly improved. def pulls harder around the 2000rpm area. when accelerating up to the new redline, it pulls allll the way up to the limiter. -you pass 60 mph before you max out 2nd. and that boring k20a3 now sounds like a proper Si. turnaround time: I paid for 3day from FedEx. shipped it on a saturday night and my parents signed for it on wednesday while I was away. that is QUICK. hondata gets an A+ for quickness the reflash gets an A+ for making the ep3 feel more fun to drive like an em1 kseriesparts.com gets an A+++ for handling the transaction the BEST $300-340 (depending on method of shipping) you can spend with an oppurtunity to get kpro down the road stock k20a3 with a injen SRI
Sergio | February 7th, 2012
Just got my reflash. Dam this runs good now. Love those higher rpms. Has a hell alot more top end. I totaly recomend it. Pulls harder than my brothers 09 si.
William Chu | May 11th, 2011
The reflash was decent... I didn't think it was that great of a gain. On the other hand, I love CRSX. Best service! Very prompt and easy to deal with. Never had a problem buy anything from here. a "B" for reflash but definitely an "A++" for CRSX.
Dustin | April 23rd, 2011
This is exactly what the EP3 needs your crazy if you don't do this and shipping is so fast I sent the ecu on Tuesday at about 4:00 from Indiana and had it back Thursday at 1:00. Great purchase I love it.