03IronPony

I am not really familiar with these but i have heard some talk about them, What exactly will these do for my car or what is the purpose of them?

bigedog8

they are a little bigger so they slow the rotation of the belt and there is less parasitic loss on hp because the accessories arent running as fast and as much drag etc. etc.

matt123

could this cause stalling with the a/c on? anyone have issues with this or overheating?

bigedog8

i dont have them personally, my gf's 5.0 car supposedly has some but i think the other owner was full of it. she has no problems and most people on here dont have many problems unless they have a big *** stereo which is hell on the alternator anyway but worse with the udp's. hopefully someone with a 4.6 and udps can chime in

Sable

They will not cause you any problems if installed properly. The advice in the earlier posts is good advice.

Sidewayz6.0

It's really pointless for you to post. Nobody can see what you're saying.

16 WITH A 97 GT

I have underdrive pullies on my 97 gt and its fine with a/c on even with everything else on with it