from what i'v seen around these forums try keep pipe size down to 2.25 to 2.5 MAx twin.. the bigger u go the more your car will "moo" and drone. gas velocity is important for a good note and minimal annoying drone. but yeah, from what i'v seen the pacemaker extractors with twin cats and a 2.25 -2.5 twin system go very well.. i could be very wrong though.


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