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Doing upgrade on 06 ultra . Big bore kit ,cams, cnc ported heads my question is what’s the best performing true dual exhaust and mufflers ? And are all performance mufflers 4 inch ? Does anyone make 3 1/2 performance muffler thanks
 

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Doing upgrade on 06 ultra . Big bore kit ,cams, cnc ported heads my question is what’s the best performing true dual exhaust and mufflers ? And are all performance mufflers 4 inch ? Does anyone make 3 1/2 performance muffler thanks
True dual is not a performance option, people still use them for the sound. If its just the look you want, then the S&S setup with the hidden crossover works as well as any of them.

For peak performance, you'll need to go 2-1. And if you just want to split the differance, one of the X-Pipes would work. Jackpot and Fullsac make nice ones that will fit with your oem shields.

As for cans, they come in 3.5 - 4 - 4.5 in about any setup you could want.
 
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