Underdrive Pullies, are they worth it?

[Five.0]

its probably one of the cheapest and best mods i put my money on. Mac pulleys, you cant believe this, down the road my water pump was read to give out (80,000 miles)
and the idiot that i was, i actually went to ford, (needs explanation), anyway long story short, they put the originals back on, and i drove the car and it felt so stock. i tried to rip in third, ofcourse it didnt happen. i said the hell with that, went home did it my self, put the Macs back on, i ripped in third like a stock would rip in second. need a shorter belt though.


94GT
shorty headers, pro chamber h-pipe, 2 chamber flows, mac pulleys, ram-air, superchip, 3.73, 2" drop riding on 275/40/17's all around.