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AWDtuning STi 04-21 drivetrain package

Price

$3,168.38

Included in This Package

  • ACT HDSS Clutch Kit

  • OEM STi Flywheel

  • New Front Axle Seals

  • Red Line Transmission and Differential Fluid

  • COBB Stage 2+ Drivetrain Package STi (White or Black)

  • Professional Installation

About the Package

This drivetrain package includes clutch replacement, Cobb short throw shifter kit, shift knob, and new transmission and rear differential fluid. Ensure that your shifts are crispy and your drivetrain is healthy with our drivetrain package.
The ACT HDSS clutch is a full face organic clutch that will hold more power while retaining the ease of driving that the factory clutch has. The clutch kit contains a new; clutch disk, and pressure plate.
The COBB Stage 1+ Drivetrain Package will tighten up your shifter assembly for faster shifts and better feel. The package includes; Short throw shifter, Front and Rear Shifter Bushings, and Weighted Shift Knob in either white or black.

AWDTuning is a full-service performance and motorsports shop based in Flower Mound, Texas, serving DFW and clients nationwide through remote tuning. We specialize in calibration, diagnostics, dyno testing, performance maintenance, and custom builds across Subaru, BRZ/GR86, Nissan VR30, Mustang Coyote, GT-R, and more.

Unlike basic repair shops or “flash tune” operations, our approach is data-driven and reliability-focused. Every vehicle is evaluated as a system — fuel delivery, airflow, ignition, mechanical condition, and usage goals all factor into how we build your calibration or repair strategy. Whether you need remote e-tuning, dyno verification, standalone ECU calibration, or in-depth diagnostics for a problem car, our process is structured, repeatable, and transparent.

We work with COBB, EcuTek, HP Tuners, and professional standalone systems such as Haltech, Link, Emtron, and MoTeC. In-house Mustang AWD dyno testing allows us to validate changes under controlled load. Our diagnostic workflow is built around solving issues before tuning — misfires, knock, boost leaks, fuel pressure problems, drivability concerns, and sensor plausibility checks.

From daily-driven street cars to high-horsepower builds and motorsport applications, AWDTuning provides complete support from initial consultation through final calibration. If you’re looking for a shop that understands both performance and reliability, you’re in the right place.

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