I have a b20v b20b bottom gsr head, in my del sol. Im runnin on single cam piping exhaust right now. probablly gonna go to a muffler shop and have em make me a custom exhaust system does anyone kno what size is the best 2" 2.25, 2.5 2.75 piping? im also pickin up a 4-1 dc header today so ill be making my system from the header back.