anyone have any probs with BBK Underdrive Pulleys

[tryinkeepup]

i have a set of the piggy back type pulleys.and heard they can give u probs. also any 1 get any noticeable gains? thanx

 

[lvmustanggt]

I got steeda UDP FTMFW

 

[kuwait]

i had them installed for a while , no real problems , just that the altenator pulley had a whine to it when i was done , so i had to take the altenator pulley off.

i think you can feel abit of diffrence when you get on it , thats about it.