Scirocco Central

Simple question. Im getting a custom system made, anybody found any information on the best size for a R?

If your getting the full exhaust done, then 3inch is sufficient. you can go 3 inch all the way to the back box which will probably be the best for flow but not essential. some taper down to 2.5inch which still get decent gains

Yeh figured 3 inch, just concerned about sound. I dont want to be that dumbass with a WRX milo tin which sort of sounds like a sick cow when they take off...