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Restoration Projects / Re: 1978 Y88 Gold SE 4sp
« Last post by wheels78ta on February 04, 2024, 09:33:43 PM »The Ram Air manifolds will be 2 1/2"......same as down pipe and x pipes etc. What size is your exhaust? I know you can go down to 2 1/4" from the manifolds but I'm going to stay 2 1/2" for the whole system. I may need to call Borla and see what they recommend. They are not cheap by no means but they are a great system to have.