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Hoping not to make myself seem too dumb, here goes. I have recently put a new exhaust on my bike, I installed it myself, cause I like to learn how things work. I have noticed in addition to it being way loud (which is ok, I wanted louder than stock), I have noticed it backfires when downshifting or just letting off the throttle. I don't beat on the bike, not running at high revs and downshifting fast, just riding normally. I asked the local shop I go to, and they said it was installed very well and suggested a Power Commander, to remap and stop the backfiring. Will this really help, or is there a way to stop the motor from backfiring without spending an additional $300+ . If it matters the bike is a 2007 ninja 650r, which is the parallel twin, and the exhaust is a Jardine GP-1 slip on exhaust. Thanks ahead for any help - bryan
p.s. The box the jardine came in said "GP-1, race core", this isn't the problem is
it? I thought that just meant it was basically a straight pipe.