I'm running a 1000watt 4 channel amp with another 400watt 2 channel and 2 12'in subs and i have udp's with a capacitor and i have no problem at all. No dimming at night or anything.

underdrive pulleys are a waste of money.


So you are saying the skills and tools of a backyard mechanic are equal to that of the mechanics at Steeda and Saleen?If udp are suck a waste of money, and not worth anything. How come Saleen uses them? or what about Steeda??![]()
So you are saying the skills and tools of a backyard mechanic are equal to that of the mechanics at Steeda and Saleen?
So you are saying the skills and tools of a backyard mechanic are equal to that of the mechanics at Steeda and Saleen?

As for the crap in the thread about "just install them but do not install one on the alt"...
The crank pulley when changed underspins ALL. The alt pulley in the UPD set is actually smaller than stock and brings the alt spin back within factory tolerences.
So that was bad advice.