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07 M7 lacking rpm

C
well for some time now something things have not been right? " loss of rpm" stock sled that has always pulled strong.new belt helped but still wasn't right. Saturday took my only mod part off sno stuff can. sled started out the day not bad but got louder and louder and lower prm's something not right took the skin off my pipe and there it was a 6 inch split.....for your info on what the exhaust system really does. put a new stock pipe on and then sled pulls hard once agian!!!! rpm is 7800-8000
 
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