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Hondata 12-15 Honda Civic Si / 13-15 Acura ILX ECU Reflash

Hondata 12-15 Honda Civic Si / 13-15 Acura ILX ECU Reflash-A1
Hondata 12-15 Honda Civic Si / 13-15 Acura ILX ECU Reflash-A2
Hondata 12-15 Honda Civic Si / 13-15 Acura ILX ECU Reflash-A3
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Hondata 12-15 Honda Civic Si / 13-15 Acura ILX ECU Reflash

★★★★★ ★★★★★ 3 Reviews
$290.00 & Free Shipping

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The 2012-2015 Honda Civic Si/ 2013-2015 Acura ILX Hondata reflash advances the ignition, alters the cam timing and optimizes the fuel adding up to 15hp and 12ft/lbs of torque across the rev range.


  • 10-15 top end HP gain depending on the dyno and modifications
  • 5-12 ft lb top end torque
  • Rev limiter raised to 7600 rpm
  • Improved throttle response
  • Speed limiter removed
  • VTEC point is unchanged
  • This program was not tuned specifically for an intake. Any correctly designed intake or exhaust modification should work well with this reflash.
  • The reflash reduces the 'rev hang' effect to a minimum.
  • California emissions legal (CARB EO D-742)


US 2012+ Civic Si (ECU part number 37820-RX0-A03 through RX0-A12)

US 2013+ Acura ILX (ECU part number 37820-R9B-A02)

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.

WARNING: This product may contain chemicals known to the State of California to cause cancer or birth defects.


Brand: Hondata
Part Number: K24Z7-Si
CARB Approved: Yes

Vehicle Fitment

Acura ILX
2013 Acura ILX 2.4L 2014 Acura ILX 2.4L
Honda Civic
2012 Honda Civic Si Coupe 2013 Honda Civic Si Coupe 2014 Honda Civic Si Coupe 2015 Honda Civic Si Coupe
2012 Honda Civic Si Sedan 2013 Honda Civic Si Sedan 2014 Honda Civic Si Sedan 2015 Honda Civic Si Sedan

3 Reviews ★★★★★ ★★★★★

★★★★★ ★★★★★
5.00/5.00 Stars out of 3 Reviews
Write a Review
Senior Manager
Dave | June 7th, 2020
Don't know or care that much about measured HP improvement- though I'm pretty close to sea level so whatever gains are possible I'm likely getting. Regardless, just the drastically reduced rev hang and noticeable bump in mid range torque based on the butt-dyno are WELL worth the $. Super satisfied!
A Must have for 9th gen SI owners simply looking to get a little more with a basic exhaust/intake.
Danny Duarte | January 8th, 2017
After reading a few posts on the forums I decided to give the reflash a go. The 2013 SI sedan I have is a daily driver to my Fiancée,so a Tanabe Medallion cat back and Taketa intake was all that was gonna get done to the car. After receiving the Ecu back,i noticed immediately the "Rev Hang" was gone! The midrange also improved! Some say it doesnt do anything other than fixing the rev hang with little to no power gains,but that alone made it worth it! I definitely felt a small power gain in the midrange! Highly recommended if you are just doing an exhaust/intake.
2013 Si Sedan RX0A14
Sean | October 3rd, 2013
I called kseriesparts to see if they can add this product as their the site I trust. I can't remember who I talked to, but his costumer service was awesome. Had the Reflash up in no time. I had the reflash on my RSX and loved it. Now on my Civic Si, I love it the same and also gets rid of that damn rev hang issue. I don't plan on modifying past intake and exhaust so this was a perfect match for me. The reflash is so much smoother and fun to drive.