The ATI Super Damper is exclusiovely designed for high RPM Engines (6,000RPM and up). ATI was the first to develop a dampening soultion for the popular coyote engine. The damper is offered in an OEM replacement diameter (918047) with dual 6 rib serpentine drive pulleys to run the Mustang accessories. The damper will also includes provisions for bolt on crank pulleys from most popular supercharger companies. The ATI Mustang damper also comes with laser-etched timing marks and exceeds SFI 18.1 Safety Certifications.