where is the best place to find underdrive pulleys for an N/A XF??

 

tvtdesign.com

 

We no longer carry them due to our distributor selling out and not having the engineer's drawings to receate more. Once we are able to undertake production through our own means they will be available.

Right now only Evosport has them I believe.

 

how much does the evosport kit usually add hp and tq wise?

 

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.