Exedy Stage 3 Hyper Single Metallic Disc Clutch Kit – 2004-2021 Subaru STI / 2007-2009 Legacy GT spec.B

Exedy Stage 3 Hyper Single Metallic Disc Clutch Kit, 2004-2021 Subaru WRX STI

The Exedy Stage 3 Hyper Single Metallic Disc Clutch Kit for the 2004-2021 Subaru WRX STI is a single-disc metallic clutch designed for high-output STI builds that require maximum single-disc holding capacity. The Hyper Single uses a full metallic disc, copper-ceramic reinforced metallic compound bonded to a rigid steel carrier, providing maximum friction coefficient and heat resistance in a single-disc format.

DETAILS

• Disc: full metallic, maximum single-disc holding capacity
• Higher torque capacity than Stage 2 cerametallic
• Designed for high-output EJ257 builds at the top of single-disc range
• Engagement: more aggressive than Stage 2, firm, definitive grab
• Fitment: 2004-2021 Subaru WRX STI EJ207/EJ257 6MT

The progression from Stage 2 cerametallic to Stage 3 metallic is a meaningful step in clutch aggression. The Stage 3 Hyper Single disc has a higher coefficient of friction than cerametallic, it grabs harder and releases more definitively. For high-output STI builds where the Stage 2 HD has shown its limits, the Hyper Single provides the capacity increase needed without committing to a twin disc.

The Hyper Single is positioned for STI builds that are genuinely making power, turbocharged builds with upgraded injectors, fueling, and aggressive tune at the upper end of what a single disc can handle. The engagement character requires some adaptation: the metallic disc does not slip in the engagement zone the way an organic or cerametallic disc does, so rev-matching and clutch control technique become more important.

What’s in the Box

• Exedy Hyper Single metallic disc
• Exedy pressure plate
• Release bearing
• Pilot bearing
• Alignment tool

Why Choose Exedy

Exedy is the world’s largest clutch manufacturer and the OEM supplier to more than six major vehicle manufacturers globally, including Toyota, Honda, Subaru, and Mitsubishi. Every Exedy performance clutch is designed and manufactured as a purpose-built performance component, not a modified OEM part, not a remanufactured unit, but an engineered system built specifically for performance use from the ground up. Exedy’s research and development happens on actual race programs alongside their road car product development, meaning the technology that wins championships filters directly into the street performance catalog. When you install an Exedy clutch, you are installing a product from the company that builds the OEM clutch for the car it is replacing.

The RallySport Take

The Exedy Hyper Single for the STI is the bridge between single-disc cerametallic and twin disc. For high-output EJ257 builds where Stage 2 is insufficient and a twin disc is more than required, this is the correct specification. Fits the 2004-2021 Subaru WRX STI with EJ207/EJ257 6MT.

Fitment