SGT/SC#0471 Posted March 10, 2009 Author Report Share Posted March 10, 2009 No, there is no difference in the head unit, see my prior post. Only pulley changes and belt. Whipple correct FRP's earlier statement. Thanks I apreciate your post. Link to comment Share on other sites More sharing options...
stwsam Posted March 24, 2009 Report Share Posted March 24, 2009 Received my 3.125 pulley and belt the day after ordering from Whipple. Total cost was about 270. Installed this weekend. After figuring out how to manipulate the spring loaded belt tensioner, the change out was pretty straight forward. The 50hp boost, and I will have no idea what it is until dynoed again, is very noticeable. A very nice bang for the buck. I would certainly recommend if you have the 500hp whipple already installed on your 4.6 Link to comment Share on other sites More sharing options...
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