89Indy500 a friend of mine who use to owned a performance shop took a 500 motor and tried to blow it up on the dyno. He tried a number of different pipe combos and none of them worked very well. He did find out that if you cut 1 inch out of the stock pipe just before the Y pipe it gave the sled 5 hp. It takes a little to fit the pipe back in but it is cheap hp. Riley
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