Pullies give back hp, not gain. Ford claims 260 HP but that's with the engine dyno. Ever watch horsepower TV? You''ll see one in action. Once installed, you're stangs real HP is around 245 HP. Atleast that's what I've seen on a stock GT strapped to a dynojet.
They are worth it. You will get high single to maybe low double digit gains maybe. Most of the time its a high single digit gain. For the $150 you will spend on the pullies look into the stewart components water pump. Same price as the steeda pullies but with a better wheel horse power gain.
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what all you guys need to understand is our cars don't respond that well to bolt-ons. you might not even see a gain from ud pulleys, its when you do alot of little bolt-ons that you see and feel the difference.
it effects all superchargers. What i meant with feeling the difference is when you add alot of bolt ons at the same time. You not gonna feel a difference with just u/d pulleys, or a water pump, or a cai, people say they are but you can't tell the difference gaining 6-9hp
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fell free to explain. I dont understand how it would loose boost when the pullies are technically smaller in different places. Stock belt is still on my car with underdrive pullies and so if the belt length is the same, wouldnt the boost be the same?
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1996 Mustang GT - Racecar
1995 Mustang GT - Daily Driver
Special Thanks to: PoorMan Motorsports Full Parts Supply MIA Motorsports For any Chassis Related Work or Drag Wings