4 or 5 inch exhaust
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i have a custom fabricated 3 to 5 inch flange right off the turbo. my downpipe is 5 inch all the way down past the firewall and straight back. got the 5 inch from a buddy for 175 bucks. i personally like both 4 and 5 inch. i love the deep 5 inch drone at about 2100rpm but then i hear other 24v's with 4 inch straight pipe and it has a louder high pitch noise to it. they both sound badass. just preference. 4 inch is easier to fit down past firewall and doesnt take up as much space as 5 inch.