Hey, I have a question for anyone that has or knows anything about underdrive pulleys for the v6 Mustang. I just ordered the 25% reduction crankshaft pulley and harmonic dampener, but they sent me the 42% reduction, and I know they change the full charge RPM's, and I was just wondering if the 42% would throw me off, especailly since I have a 1400 watt system. I just wanted to know if anyone knows the RPM's before I would hit full charge. I know with teh 25% it was around 950, but I wasnt sure how much the 42% would throw it off. Thanks.