ATI's Super Damper for Subaru WRX EJ20, EJ22 and EJ25 engines

Unlike undampened underdrive crank pulleys, which offer no protection to high-performance engines, the ATI Super Damper provides balanced dampening of torsional crankshaft vibrations at all RPM levels. The ATI Super Damper comes with laser-etched timing marks and is a direct replacement for the OEM unit. The ATI Super Damper is a critical component for all high performance cars to help protect against engine harmonics and features four-groove and five-groove serpentine belt drives on the outer shell to utilize the factory serpentine belt set-up. All ATI Super Dampers exceed SFI 18.1 Safety Certification and are approved for competition use.

Features:

Dampens torsional crankshaft vibrations at all RPM levels
Protects against engine harmonics
Direct replacement for the OEM unit
Four-rib and five-rib serpentine belt drives
5% Overdriven
Utilizes factory serpentine belt set-up
Laser-etched timing marks
SFI 18.1 Safety Certification and are approved for competition use
5.5" Diameter
6lb Weight

Specs:

Shell Material: Aluminum, Part #916883 5% Overdriven
Hub Material: Steel, Part #916884
Inertia Weight: 2.2 LBS, 3-Ring

Please note: Honing may be required if using aftermarket cranking due to tolerance differences compared with OEM.

ATI

ATI Super Damper - Subaru EJ20/22/25