does anybody what the power increase figures are for putting on a tubular turbo manifold? or how much it effects spool time?

im debating on fabricating my own (with a professional welder/machinest) for my turbo setup im running now, or waiting a few years and doing it when i upgrade the whole system.


also, my wastegate flapper door rattles. i can slightly hear it at idle and much more during decel (in gear). anybody know how to fix this?

 

remove the twin scroll door.

 

its an S5 hotside. no twin scroll.