Honda Custom Tuning

FREE JSTUNED Decal, JSTUNED Colorblock Decal, Team JST Printed Decal, Team JST Decal, or JSTUNED Keychain with Custom Tune Purchase! Discount will ...

FREE Decal or Keychain with Custom Tune Purchase! Discount will be applied during checkout, just add your swag item of choice to the cart along wit...

Contact us via email at sales@jst-performance.com for custom tune and/or dyno tune options! Simple ECU flashing with gauge package! The in-cabin m...

Our KTunerFlash V2 tuning package comes with a single KTunerFlash V2 hardware unit paired with a single user license for the KTuner software. 5″ T...

Introducing the COBB Accessport for Honda USDM (FC1/FC3) 2017-2020 Civic SI Simple ECU flashing with gauge package! The in-cabin mountable Accesspo...

Contact us via email at sales@jst-performance.com for custom tune and/or dyno tune options! Introducing the Accessport for your 2023-2024 Honda Ci...

Important NoteNo instant jailbreak is available for the DE5 ITS.  The ECU must be sent to Hondata to be jailbroken. The FlashPro will not work unti...

The FlashPro allows full user tuning and datalogging for your Civic Si 1.5 Turbo. It includes Windows based software called FlashProManager. The Fl...

The FlashPro allows datalogging and limited tuning for your 2022+ US Civic 1.5 Si Turbo. It includes Windows based software called FlashProManager....

The FlashPro allows full user tuning and datalogging for your Civic Type R (FK8) 2.0 Turbo. It includes Windows based software called FlashProManag...

Important NoteNo instant jailbreak is available for the FL5 CTR.  The ECU must be sent to Hondata to be jailbroken.  The FlashPro will not work unt...

Our KTunerFlash V1.2 tuning package comes with a single KTuner hardware unit paired with a single user license for the KTuner software. This unit ...

Introducing the COBB Accessport for Honda Civic Si (FE1) 2022-2024. Simple ECU flashing with gauge package! The in-cabin mountable Accessport V3 ha...