Any type of bigger b-pipe than stock one make stock muffler very farty. I have used 2.5 and 3.0 with stock muffler. Low speeds and cruise is good. WOT, nothing but fart, especially with the 3.0 straight mid pipe.
I have seen a cross section cut out somewhere and it showed that th ep3 has smaller muffler internals than the audm dc5 equivalent. Best OEM was shown to be JDM dc5 and audm dc5s. This is only from visual exhaust cutouts and not from hard dyno runs. It kinda makes sense since the ep's muffler is alot more compact than the dc5's.
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