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I'm full catless with ace 421 header. Had to weld in a much larger resonator(it's actually a 4x9x17 magnaflow muffler) in the mid pipe and running a Greddy sp elite. I don't see how any of the single exits are going to muffle enough of the sound as they are all straight through style cans.
If you really need the single exit look you can use the q300 or sp elite and chop off and block one exit pipe.
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