why is everyone ragging on mpx or any other pulleys for our cars? I have heard oil pump failure? what does the oiling system have to do with the pulley? some say its also a harmonic balancer (the factory pulley)? some one please with some 1st hand knowledge let me know. thanks

 

this is not first hand knowledge but a good friend of mine has the underdrive pulley and he loves it!!! ive also heard alot of crap about it too, but his car runs F'N STRONG ! and thats a fact