1. S

    Induction pipe work

    So as I'm awaiting my new turbo, I'm going over things that I may need to buy or alter. My current turbo has a 3 in inlet and my new one is a 4 in. Would it be fine to just use a 4 to 3 in coupler or is it best to get a 4 in induction pipe? Obviously getting the coupler would be cheaper, but...