[Vtfanaj]

I'm looking to get some Under Drive Pulleys for my 2003 Mustang Gt, but I'm hesitant because i heard that they can cause problems with your accessory's and dim your lights. The only brand i would buy would be Steeda has anyone had problems with them??

[mustang212]

no i havent but thats the brand i reccomend i like mine ive had no problems

[racin366]

I've had them for more than 18 months now, never had a problem and I have 2 large amps powering my stereo system with 6 speakers added on top of the mach 460 system. It charges fine, no dimming of the lights. There were problems with the old fox bodies, but our alternators are stronger, go for it.

[Vtfanaj]

Thanks for the info.... I'm def. going to go with the Steeda under drive pulleys.

[05horse]

whats teh difference between regular pullies and UDP?

[stlwagon]

Originally Posted by 05horse

whats teh difference between regular pullies and UDP?

They underdrive the accessories freeing up some hp lost to parasitic drag. Any SFI-approved harmonic balancer is fine.

[braupe]

I had a set of march UDP on my 01 GTand they were great. It seemed to pull stronger on the top end. Steeda makes great products but the march were cheaper at the time. I had a friend with the steeda UDP and he said he had trouble telling the difference. All I can say is the March UDP were wonderful, no dimming, and the a/c blew just as cold as before. Good Luck

[fobra559]

Hands down I would go with Steeda pulleys. No problems at all, a great mod that frees up hp

[az99stang]

what happends if I were to use a larger pulley on the bel tensioner arm?