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They do sound as good or better than anything available. I had one on my current RG in a generally stock config & it was quite loud, even with stock compression & cams.
How much performance should I expect to gain over my reinhart true duals ? I have a thunderheader on my fxr and love it , when I bought my roadglide I wanted something different and liked the sound of the reinharts but now im thinkin performance should come before the sound and looks. I did cams , fuel management and am going with a SE heavy breather soon so.. who knows might be on my way to heads by the end of the year. Just thinkin if im going performance then I should have a performance pipe