Pulley size is now a spec

[Tim Kish]

Originally Posted by davidhuff

I have a 2007 shelbygt500 street car and just removed the 2.3L ford racing tvs supercharger and replaced it with a 3.4L whipple supercharger and 64mm whipple throttle body.Take my word,this supercharger is bad ***!

My point Dave is along the lines that you increased the supercharger size almost 50% - did you increase HP by 50%? Don't think so. The Whipple screws are not as efficient as the TVS, they have to be much larger to realize the airflow and HP increases like you have seen.