ACT Adds Prolite Flywheel Clutch Kits for Subaru WRX
Photo Courtesy of Advanced Clutch Technology
Advanced Clutch Technology has expanded its Subaru WRX lineup with new SB12 clutch kits featuring an XACT Prolite chromoly flywheel for 2005-2026 Subaru WRX applications.
Developed in response to customer demand for a complete clutch and lightweight flywheel package, the new SB12 kits build on ACT’s proven SB11 clutch combinations while adding ACT Prolite Flywheel 600895. The flywheel weighs just 8.5 pounds, helping reduce rotational inertia for quicker engine response, improved acceleration, and sharper performance.
The SB12 lineup upgrades the factory 230mm clutch and flywheel to a higher-capacity 240mm system. ACT says the 240mm clutch design increases heat capacity, durability, and drivability while supporting higher torque output for modified WRX builds.
The kits are available for 2005-2026 Subaru WRX models equipped with 2.5L turbo EJ255/EJ257, FA20, FA24, and JDM EJ25 engine applications with 5-speed or 6-speed transmissions.
ACT will offer 10 SB12 kit configurations, with torque capacity ranging from 449 lb-ft to 681 lb-ft at the crank depending on the selected disc, pressure plate, and hub setup. Street configurations use an organic performance disc with a sprung hub for smoother engagement and daily drivability, while Race configurations use cerametallic 4-pad or 6-pad disc options with sprung or rigid hubs for track-focused use.
The Street kits are designed for daily-driven and street performance applications, with torque ratings up to 532 lb-ft. Race kits are intended for competition use, with torque ratings up to 681 lb-ft. ACT notes that race-designated kits are not recommended for street use. Select Race configurations meet SFI Spec 1.1.
Each kit includes the XACT Prolite chromoly flywheel, clutch hardware, release bearing, and alignment tool. ACT says the complete assembly is precision-balanced and designed as a direct replacement for maximum installation efficiency.
Quick Facts:
Application: 2005-2026 Subaru WRX
Engine Applications: 2.5L Turbo EJ255/EJ257, FA20, FA24, JDM EJ25
Transmission: 5-speed and 6-speed
Torque Capacity Range: 449-681 lb-ft
Configurations: 10 kits available
Included Flywheel: ACT XACT Prolite chromoly flywheel
Flywheel Weight: 8.5 pounds
MSRP Range: $1,486-$1,610
Available Kit Configurations:
SB12-HDSS - Organic Street, sprung hub, 449 lb-ft, $1,486
SB12-XTSS - Organic Street, sprung hub, 532 lb-ft, $1,548
SB12-HDG4 - 4-pad Race, sprung hub, 574 lb-ft, $1,514
SB12-XTG4 - 4-pad Race, sprung hub, 681 lb-ft, $1,576
SB12-HDG6 - 6-pad Race, sprung hub, 574 lb-ft, $1,548
SB12-XTG6 - 6-pad Race, sprung hub, 681 lb-ft, $1,610
SB12-HDR4 - 4-pad Race, rigid hub, 574 lb-ft, $1,457
SB12-XTR4 - 4-pad Race, rigid hub, 681 lb-ft, $1,519
SB12-HDR6 - 6-pad Race, rigid hub, 574 lb-ft, $1,479
SB12-XTR6 - 6-pad Race, rigid hub, 681 lb-ft, $1,541
Race-designated kits are not recommended for street use.
Watch the ACT Subaru WRX clutch and flywheel installation video:
youtube.com/watch?v=ogb4aNuepxo
For more information, visit advancedclutch.com.
