on my b16 turbo...i have a 2.5 inch exhaust and its running like 12 psi on the daily....and im wondering if the small 2.5 inch straightpipe is holding me back because my car has no exhaust leak or nothing and it sounds quiet ...im talknig real quiet like vw...1.8t stock...how that would sound...should i increase the size of my exhaust?

 

holding you back ....as in making more power, YES. As far as sound goes I'm not sure, i'm using a 3" straight pipe with a resonator and its still loud