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WARNING! THIS PRODUCT IS FOR OFF-ROAD MOTORSPORT/COMPETITION RACING USE ONLY, NEVER TO BE USED ON ANY POLLUTION CONTROLLED MOTOR VEHICLE. KTuner Flash-based system for 2017-2021 Civic Si 1.5 Turbo. The KTuner Flash system allows you to reprogram/reflash your stock ECU directly over your OBD2 diagnostic port. No need to remove your ECU, etc. Simply plug the KTuner Flash system into your OBD2 port under your dash and reflash or tune your car using the KTuner software. Using the KTuner Flash system, you can retain all of your factory drivability, emissions, and reliability, while still being able to tune your engine for modifications (ie: intake, exhaust, boost increases, etc). The result will be a much better running engine with increased power! What is included with the KTuner Flash system? KTuner hardware (part that plugs into your OBD2 port) USB cable (plugs into your laptop on one end, and into the KTuner hardware on the other end) Pair of KTuner window decals KTuner software (download for free here: http://ktuner.com/downloads/) Part numbers for usable ECUs include: 2017-2018 MT 37820-5AM-A01 through A03 37820-5AM-C01 through C03 2019 37820-5AM-A11 through A12 37820-5AM-C11 through C12 2020 37820-5AM-A21 through A22 37820-5AM-C21 through C22 Feature List: Real-Time Logging Ignition / Fuel Tuning Flex Fuel Ignition/Fuel/Boost Tuning Rev Hang Disable Throttle Padding Quick Adjustment Throttle Control Quick Adjustment Rev Limiter Settings 2-step Settings On The Fly Launch Limit Adjustment Full Throttle Shift Limiter Anti-lag Settings On The Fly Map Switching Three Tune Level Settings (For OTF Map Switching) Dual Boost Targets For Normal And Sport Mode Boost By Gear Turbo Responsiveness Quick Adjustment Turbo Ramp Quick Adjustment Fuel Correction Parameters Ignition Correction Parameters Closed Loop Control Disable Sensors Fuel Cut Parameters Idle Control Parameters Speed Limiter Removed - Please adhere to your tire speed limitations. This package includes multiple starter maps, Factory, 19.5PSI, 21.5PSI, 23PSI, and 19.5/23PSI dual tune activated by the Sport button. Also included are quick adjustments that give you easy levels of control for throttle response, partial throttle boost response, and turbo ramp lag. Pick the combo of settings that’s right for your testing needs! We are currently offering multiple research calibrations based on our 1.5T maps from the standard Civic with more to come in the future. All tunes should be run with 91+ octane for expected results. Factory Starting Point: Improved throttle response Removed throttle dampening on low end, better performance off the line Factory boost levels Starter 19.5 PSI: Improved throttle response Removed throttle dampening on low end, better performance off the line Reduced turbo lag Improved low-end and midrange torque Boost raised to 19.5psi after peak torque, whereas factory only targets 19 at the peak RPM of 5700 and then drops off again Producing a much more sporty feel, better drivability, and additional top end power! Starter 21.5PSI: Improved throttle response Removed throttle dampening on low end, better performance off the line Reduced turbo lag with aggressive spool up Improved low-end and midrange torque Boost targets raised to 21.5psi Producing a much more sporty feel, better drivability, and additional top end power! Starter 23PSI: Improved throttle response Removed throttle dampening on low end, better performance off the line Reduced turbo lag with aggressive spool up Improved low-end and midrange torque Boost targets raised to 23psi Producing a much more sporty feel, better drivability, and additional top end power! Starter 19.5/23PSI: Improved throttle response Removed throttle dampening on low end, better performance off the line Reduced turbo lag with aggressive spool up Improved low-end and midrange torque Boost targets 19.5psi in Normal Mode Boost targets raised to 23psi in Sport Mode Producing a much more sporty feel, better drivability, and additional top end power! Other Dual Mode Starter Maps: Factory Normal/19.5 Sport Factory Normal/21.5 Sport 19.5 Normal/21.5 Sport Factory Normal/23 Sport Improved throttle response Removed throttle dampening on low end, better performance off the line Reduced turbo lag with aggressive spool up Improved low-end and midrange torque Producing a much more sporty feel, better drivability, and additional top end power! Flash Back To Stock At Any Time Dyno Testing 23PSI Basemap: Gains: 56wtq, 35-40whp midrange, 34whp peak to peak. There’s more left in the top end, but we’re staying conservative. Custom tuning can take it to the next level. Dyno Testing 23PSI Basemap with Flex Fuel Kit (E35): Gains: 75wtq, 60-65whp midrange, 65whp peak to peak.
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🇺🇸 Ship from USA · On Agora since 2026
$549.00