Enhance Your 2015-2021 Subaru STI with Premium Drivetrain Upgrades

Optimizing your 2015-2021 Subaru STI’s drivetrain is key to unlocking sharper response and improved durability under demanding conditions. Our collection offers a wide range of performance and replacement parts designed specifically to maintain and elevate your STI’s power transfer and handling precision.

When is it time to upgrade your clutch on a 2015-2021 STI?

Clutch wear is a natural part of driving, especially if you push your STI hard on the street or track. Signs it’s time for an upgrade include slipping under load, a spongy or inconsistent pedal feel, or difficulty shifting smoothly. Upgrading your clutch can improve engagement, increase holding capacity, and provide a more direct connection to the drivetrain.

• Notice slipping or burning smells during spirited driving
• Difficulty shifting or inconsistent pedal pressure
• Planning power upgrades that exceed factory clutch limits
• Seeking a more performance-oriented clutch feel

Lightweight flywheel benefits and considerations for your STI

Replacing your STI’s stock flywheel with a lightweight option reduces rotational mass, allowing the engine to rev more freely and respond quicker to throttle inputs. This upgrade enhances acceleration and throttle response but can change drivability characteristics, sometimes making idle less smooth. It’s important to balance performance gains with daily driving needs.

How do short shifters improve the driving experience on a Subaru STI?

Short shifters reduce the throw distance between gears, resulting in quicker, more precise shifts. This upgrade enhances driver engagement and can improve shift feel, especially during aggressive driving or track use. Explore our selection of STI short shifters and other drivetrain components at Subimods to tailor your drivetrain setup for both performance and reliability.