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Do you have the hi-mount tune downloaded from the dealer? That would probably balance it out a bit.
Mine has a nice burble and an occassional backfire on decelerating (I just installed the hi-mount, but haven't had the dealer install the tune yet), but I wouldn't call it excessive backfiring.
One other question: Does your gas cap hiss or have a lot of suction when you open it to fill up? I had this for a while (thought it was normal), but dealer found a kinked vacuum or breather line to a throttle body (can't remember which), so he balanced and re-synched the throttle bodies. It instantly ran better with no more backfiring...
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