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Thunderheader has been a name associated with quality 2/1 pipes for a long time- louder than I like, but...
undecided? 2/1 adds power, true duals...may offer more than a stock noise emission compliant set up, but not the best bang for buck if you are looking for performance gains
The X version is designed for large displacement motors. If you're sticking with the 103" in your 2012, you'd be better off sticking with their standard pipe.