pony-ED

how does this create 10-14 horsepower can anyone tell? or is it a waste

2005Redfire6

It will free up horsepower but won't give you that much, the rule of thumb is to take what the manufacture says it will add and divide it in half. Not worth it IMO.

pony-ED

what does imo mean lol

Nuke

imo = in my opinion

An Underdrive pulley (UDP's) will reduce the amount of loss in the driveline; it does not CREATE power. The gain is really that reduction in loss. And UDP's MAY give you about 5 RWHP. If the 10-14 that you state is advertising, you need to take 2 "no-longer-gullible" pills and call me in the morning.

If you want to gain power, check out the Cold Air Intakes (CAI's) and custom tune combos on Brenspeeds and American Muscles websites.

kzonts

What Nuke said. Another great mod is the rear gear ratio. It doesn't add horsepower, but improves the torque at the rear wheels. Makes the driving experience much more fun.

157dB

As far as I know there is only one
company making the UD pulleys for the 4.0.
And there is a reason for this...
The market is just not there nor are the performance gains.