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I have a D&D and hate it.... for performance you cant beat muzzy or akra... muzzy does R&D for kawi, so their systems are highly specific. The akra is known to do very well with 9r's as well. I wouldnt do a full system as the 9r headers are VERY nice for stock. You wont see much of a difference w/ full exhaust. Other than that, if you want to be loud, just run without a muffler (just kidding, please dont).
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