I have an '02 gt with a pro 5.0 shifter, o/r h, flowmaster catback, 78mm bbk tb and plenum, 373 gears, and a s&b CAI. It is a daily driver and I am getting the magnapack catback, and was wondering if the underdrive pulleys were worth it, especially reading some bad things with running hotter than normal. What do you think? Thanks!

 

i've had mine on for a couple months, and mine does not run any hotter than it did before.

 

It will run fine, and make a small difference in the higher rpm's.

 

Not if you want to go FI. Stock ones are needed.

 

if you plan on going F/I in the future, the UP would be a waste of money since you would change back for the blower

 

Why can't you use aftermaret pullies with a S/C.

 

because you dont want to "underdrive" the blower.

 

im sorry but i gotta say something about runnin udp and a s/c. if your only running around 10 psi, you jus got to regear the s/c pulley(smaller) and you will be fine.

 

yea but then youre shelling out money for a UDP set and for a smaller pulley for the SC. I'd rather skip the UDP and leave the stockers on for the FI if I planned on it for the future that way i save some $$ for the time being. And if you changed the pulley wouldnt the blower be running twice as much for stock pulley levels of boost?

 

They dont really do all that much... but they are one of the cheaper mods u can do, so why not!?