1987 Ford Mustang GT Making Noise - Engine


Question: 1987 Mustang GT 5.0 HO with T-5 super duty tranny, Flowmaster stage 3 cat back, 30lb injectors, 130 amp alternator.When not in gear and i rev the motor i get a grinding noise at about 4500 rpms, and the car shakes a little bit when returning to idle at about 3000 rpms.The sound seems to be coming from/around the smog pump. Can i by-pass the smog pump and the car still run properly?I live for horsepower not emissions! What other componants can i safely by-pass(besides a/c)without comprimising the engine running safely?I'm also looking to buy a Wieland bolt on supercharger for my car, what other parts would be essential and/or necassary to do this? I'm currently running a stock cam and have a pair of shorty headers on order.I've read all the questions and answers in your column by the way and would eventually like to put a fogger system on my car also.Thanks for your time and help

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Owner: Ummmm, under hard acceleration, the shifter will kick out of 1st and 3rd gear.I was thinking that the syncronizers were/are going bad but a friend of mine suggested the "shifting fork"might be bent since the T-5 is a fresh rebuild with just over 1200 miles on it. Any ideas, advice, ways to determine what the problem is?

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