I have the pulley kit TVT used to distribute - I like it. Not a huge gain but it is noticeable. I would suggest doing the crankshaft pulley at the same time - I didn't and wish I had (it's about another $450 from AMS). You will need a new belt with the pulleys, and apparently the one which you receive with the pulley kit is not the correct length!!! I have the pulley and length you need at home - I purchased it from RockAuto, they were the cheapest. Talk to Anthony and I'm sure he can tell you the pulley size.