Two Step Performance

TSP Stage One+ Tune for the 2017, 2018, 2019, and 2020 Honda Civic Si


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  • $149.99
  • Regular price $179.99

Customer Reviews

Based on 19 reviews
Anthony Monahan (Raeford, US)
Excellent Tune

I still need to complete a few mods to actually feel the complete power this tune gives my vehicle. Customer service is there if you need it and as always, KTuner allows for simple tweets, but this tune definitely is near perfect for what it intended to produce. Thank you again for a superb product.

Sean Sullivan (Ashland, US)
Tsp Stage 1.5

Been on this tune for about 3 months now and I’m loving it every one bit ! Great power feel and phenomenal turbo response !

Jonathan Gutierrez (Clermont, US)
Great tune !

I’ve been on the stage one plus tune for about a week now and it’s fantastic. U feel the power difference right away without loosing much of the factory feel .

Jeremy Bartlebaugh (Greensburg, US)
Great tune

Amazing tune

Sebastian Wiley (Los Angeles, US)

TSP Stage One+ Tune for the 2017, 2018, 2019, and 2020 Honda Civic Si

Damien Burrs (Dayton, US)
Tested, proven, facts!

I followed 2 steps lead and built my 10th gen 2017 civic si with all PRL bolt-ons, acuity shifter stuff, skunk2 3" exhaust dual 76mm canons, mishimoto oil cooler with filter relocation, and big brake upgrade. After adding this stage 1 plus tune is for real no joke, omg my civic si is fast AF!!! Camero so, and mustang 5.0 were 2 of the victims, as surely there will be more! To those who will try me hopefully you're not trying to impress some chic either, cause the dragon will now definitely expose your weakness!!! WTG 2SP!!!

** Are you an existing TSP Stage 1 Si tune owner? If so, upgrade using the link HERE and save on your purchase!


Are you looking for the highest level of safe power output from your 2017+ Civic Si? Look no further!

Two Step Performance continues to partner with Derek Robinson to offer an even more powerful tune for the 2017+ Si. Full details are as follows:

234whp / 279tq - TSP Stage 1 Tune
248whp / 290tq - TSP Stage One+ Tune

All testing was completed on a stock 2020 Civic Si running 93 octane fuel. Tune features include:

  • Numerous fuel, ignition, turbo response, throttle response changes.
  • More aggressive tuning strategy compared to original TSP Stage 1, allowing for more midrange and top-end power.
  • Increased warm idle speed to eliminate vibration from aftermarket mounts.
  • Standard MAF, PRL Motorsports "Race MAF", and 27Won Performance "Race MAF" support (select appropriate option)
  • WOT shifting enabled. (Set to 5000RPM)
  • Adjustable launch control enabled.
  • "Rev hang" disabled with soft throttle padding (user adjustable)
  • Several tweaks to smooth the feel between gear shifts.
  • All disables / monitors are able to be adjusted by the end user.
  • Quick Boost By Gear is able to be adjusted by the end user.
  • On-the-fly boost map switching active for normal and "Sport" modes. (see below)
  • Throttle Responsiveness & Throttle Padding Settings are allowed to be adjusted by the end user so that the overall feel can be aggressive or more toned down, as desired. 

Map 1: Factory boost levels and turbocharger response.
Map 2: 19psi normal, 21psi "Sport" mode, Improved Turbocharger Response 
Map 3: 26psi normal & "Sport" mode, Fastest Turbocharger Response


Factory boost level in "Map 1" allows for easy "valet" mode when the KTuner unit is unplugged from the car!

93+ octane REQUIRED. Use of lower grade fuels is NOT tolerated, and will result in power loss.

  • 100oct race gasoline is suitable, as long as it does not contain lead.
  • The calibration will support up to about 15% ethanol content if necessary to increase knock resistance. For example, you can blend approximately 1 gallon of E85 with 91 octane to achieve the knock resistance required to safely and effectively use this tune.

Upgraded clutch recommended.

Suitable for use with the factory intake or a QUALITY aftermarket intake that keep fuel trims in check such as the PRL Motorsports Cobra. Aftermarket downpipes are also fine. Mods such as this are expected to add power that is not accounted for in our dyno testing.

In addition to standard sized intakes, the PRL Race MAF Cobra & Short Ram intakes as well as the 27Won Race MAF intake are supported. Please select the appropriate option for your intake when ordering. Need to make a change later down the road? Take advantage of our File Conversion Service.

*Tune orders placed during business hours are typically fulfilled via email the same day. Orders outside of business hours are filled the following business day. FlashPro tune orders may be slightly delayed due to the process required to build your custom file.*

Please verify that your ECU is supported via our TSP Tune Compatibility List prior to purchase.

This tune is for the 2017+ Civic Si only. Please be sure you are purchasing the correct tune for your vehicle because digitally delivered items are non-refundable. (If you buy this for your 2016 Civic LX, it won't work, and we cannot offer a refund.)

Click here for our installation guide.