ok chaps. Im building my 325i up with a built motor and a custom top mount turbo GT30R for streetability.
Has anyone got any tips or advices on how best to fab up a new downpipe for it.
Shall I go 3" or 4"?? I may go to a T3 GT35R sooner rather than later so Im thinking 4" maybe better? and vent to atmosphere or back to the zorst?