The 1-Piece Carbon Fiber Driveshaft for the Subaru WRX STI is a high-performance upgrade designed to reduce rotational weight, improve throttle response, and deliver exceptional strength. At just 2.75" in diameter and roughly half the weight of the factory 2-piece shaft, this carbon fiber unit dramatically enhances drivetrain efficiency while maintaining full underbody clearance.

Constructed from custom-wound, high-modulus carbon fiber, the shaft provides outstanding rigidity in a compact form. It features oversized, fully replaceable U-joints and is engineered to handle up to 850 whp and 180 mph, making it ideal for high-power street builds and competition use. Even better, all factory heat shields, plates, and covers remain completely compatible—no cutting or modification required.

Beyond added strength, the lighter, single-piece design eliminates the factory hanger bearing and its unwanted movement during acceleration. The result is sharper response, smoother power delivery, and a noticeable reduction in cabin noise and vibration.

Custom applications are also available for a wide range of engine and transmission configurations—just reach out if your setup isn’t listed.

Note: Differential flange mounting holes must be drilled to accept 10mm bolts.