i wannna run 3inch downpipe on t3/t4 2.5 inch straight pipe 2 stock exhaust no cat or resonator... i would do the whole thing 3inch but i already got 2.5 inch piping wit the stock exhaust welded on no flanges the whole exhaust is 1 piece... am i gonnna be building up to much backpressure??? im also running a 60mm wastegate if that helps at all... just wanted to seee any 1's opinion thankzzz
