STI Sports Parts Chromoly 6 Speed Lightweight Flywheel Assembly

STI Chromoly Lightweight Flywheel – ST123104S000

Made for 6-speed gearboxes
Made from high-strength chrome-molybdenum steel, this flywheel has less rotational mass than the stock unit, giving sharper throttle response and quicker engine rev-up and deceleration.

• Material: Chromoly steel
• Weight: 7.2 kg, significantly lighter than the OEM flywheel
• Diameter: 240 mm

Designed exclusively for 6-speed manual (6MT) Subaru transmissions.

Vehicle compatibility
Turbo Subaru models with 6MT under the SF, SG, GD, GG, GV, GR and VA chassis codes, from early Forester and Impreza WRX STI through to the latest STI generations.

Benefits

• Quicker revs: Lower inertia gives a livelier throttle feel and faster rev recovery.
• Road and track: Motorsport-grade construction suits everyday use as well, although idle stability and clutch feel may be sharper than with the stock flywheel.
• Direct OEM fitment: Drop-in replacement for ST123104S000 / PT120101, with no machining or extra modifications required on 6MT setups.