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I run some 5 1/4" x 27" tips custom made out of 1/4" thick stainless steel and man they have there own sound to them and they sure do make my exhaust rumble lol
Go 5" but definetely not lower than 4". You'll regret 3"s i feel lol. 4 looks good but that's what I have and I wish I woulda gone 5 or angled them down more