i am looking for a set of pulleys and i see the pulley set which constist of the alt,water pump and crank pulleys, then i see a fluid dampened performance pulley from march(says 8 hp gain) where do you install that pulley for a 10 mustang gt

when i change pulleys do i have to change my belt

 

you have to change the belt because the pulleys are a different size...the crank pulley is the most important one, the others don't really do much anything powerwise.

 

Get the steeda kit. Unlike the v6 mustangs, when you change out all three pulleys, it comes out to be the same size as stock. So you will not have to change belts unless you have one that is old and need to replace it anyways. I just changed my belt because it was only 30 bucks for a new one anyways.