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I just purchased an 06 Strat with 14k as an upgrade from 95 VX750. It has Cobra long pipes that are supposed to be baffled and a Power Commander III. I put it on a Dyno yesterday and they were able to make significant changes to the good, but it still pops and backfires as you down shift? I was told to repack the pipes or upgrade to a Power Commander V, that that should fix my issues? Has anyone else had the same issues? How did you fix the problem?
 
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