This is the unicorn piece that rarely comes up for sale. The Thump version has been designed after this bad boy. $350 for the tensioner or $450 with pre-notched oem pulley bridge. You can sell your oem parts and recoup some of the investment (I sold my tensioner for $75 and $150 from my bridge). This is a manual tensioner, which gives you much better control over belt tightness and seriously reduces belt slip. A must have for a Whipple/KB/VMP blower.

Text for a pic until I can get one downloaded 270-564-4412.