...i was thinking of having a custom exhaust made with an HKS muffler

 

Kind of overkill but whatever makes you happy

 

...well i was told that for a SC'ed S, i should go 70mm or more.. and the exhaust i have now (2.5") kind of feels like its a bit restrictive..

 

3in should work nicely. How much boost are you running btw?

 

im currently at stock boost..with aftercooler, so i think im at about 5.5psi..cause if im not mistaken, the aftercooler drops you .5 boost, right? ...im thinking about going up to 7psi for sure...but might go 9-10psi..