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  1. Pipe Size Question..

    I4/I5 Engine & Drivetrain
    So next week sometime I am going to install my borla pro xs that is 2.5 inch pipe straight through. Right now, I have 3 inch pipe after my 2.5 inch pipe crappy muffler, dumped after the axle. My question is, If I ran 2.5 inch pipe to a turn down or side exit behind my rear wheel, would I notice...