Comp1 Clutch TM4-15031-CONV-B Pull-Push Hydraulic Conversion Kit Subaru STI

Vehicle Fitment

• 2004-2021 Subaru WRX STI (2.5L EJ257 Turbo, AWD, Manual 6-Speed)
• 2004-2014 Subaru Impreza WRX STI (2.5L EJ257 Turbo, AWD, Manual 6-Speed)

Fitment Notes

• Required when installing a push-style Comp1 clutch kit on a platform that originally uses a pull-style clutch release system
• Compatible with Comp1 / Competition Clutch kits: 4-15031-C, 4-15031-C-870, 4-15031-D, 4T-15031-C, 4T-15031-C-870, 4T-15031-D
• This conversion kit is also included with the above clutch kits when purchased new - this is the standalone replacement/upgrade version
• Also applicable for 2007 Subaru WRX owners performing a 6-speed (STI) transmission swap, allowing use of a push-style clutch without purchasing a pull-style kit
• Manual 6-speed transmission (TY856) only

Features

• Converts the OEM pull-style clutch release system to a push-style hydraulic setup for compatibility with Comp1 push-type clutch kits
• Forged clutch fork provides superior strength and resistance to bending or cracking under high-clamping-load clutch assemblies
• Engineered to retain as many original vehicle components as possible, minimizing additional modifications
• Includes all hardware, brackets, slave cylinder, hard line, and release bearing for a complete bolt-in conversion
• Improves clutch release consistency and pedal feel compared to the factory pull-type actuation system
• Designed as a direct-fit for the 2004-2021 Subaru WRX STI platform - no custom fabrication required
• Suitable for street, track, drag, and rally applications where the factory pull-style system is being replaced
• Made in the USA by Comp1 / Competition Clutch to high-performance component standards

Specifications

• Part Type: Pull-to-Push Hydraulic Clutch Release Conversion Kit with Forged Fork
• Fork Material: Forged steel
• Applicable Engines: 2.5L EJ257 Turbocharged Boxer-4
• Compatible Clutch Kits: 4-15031-C, 4-15031-C-870, 4-15031-D, 4T-15031-C, 4T-15031-C-870, 4T-15031-D
• Transmission: 6-Speed Manual (TY856), AWD
• Conversion Type: Pull-style to Push-style hydraulic release
• Drivetrain: AWD
• Installation: Direct-fit, no custom fabrication required

Included Components

• 1x Forged Clutch Fork
• 1x Clutch Slave Cylinder
• 1x Slave Cylinder Bracket
• 1x Clutch Hard Line (3/16" Diameter, 8" Length, Inverted Flare)
• 1x Release Bearing
• 1x Dog Bone Bracket Bolt/Nut
• 1x Starter Bolt
• 1x Engine Ground Bolt
• 1x Copper Crush Washer
• 1x Flange Serrated Hex Nut
• 1x Metric Split Lock Washer
• 1x Washer M10 Zinc Plated
• 1x Washer 5/16
• Slave Cylinder Bolts (qty included in kit)

Product Description

The Comp1 Clutch TM4-15031-CONV-B is a pull-to-push hydraulic clutch release conversion kit with a forged fork, designed specifically for the 2004-2021 Subaru WRX STI. The EJ-era STI uses a pull-type clutch actuation system from the factory, which is incompatible with the push-style clutch release required by Comp1's 15031-series twin and triple disc clutch kits. This conversion kit eliminates the need to source a pull-style clutch and instead enables the installation of the higher-performance push-style assemblies by converting the release mechanism within the bellhousing - retaining as many OEM components as possible to simplify the process.

The heart of the kit is a forged steel clutch fork, which offers significantly greater strength and fatigue resistance than a stamped or cast fork, making it well-suited to the elevated clamping loads of multi-plate performance clutch assemblies. All required hardware, brackets, slave cylinder, hard line, and release bearing are included for a complete, self-contained conversion with no custom fabrication needed. This kit is also popular among WRX owners performing an STI 6-speed transmission swap who wish to use a push-style clutch without purchasing a separate pull-type clutch kit. Compatible clutch kits include the 4-15031-C, 4-15031-C-870, 4-15031-D, 4T-15031-C, 4T-15031-C-870, and 4T-15031-D.