like the title says, im putting in dc jdm4-1 header (2.5" collector), caround cat 2.5" inlet/outlet, and 2.5" mandrel bent piping with magnaflow 2.5" inlet/outlet muffler. before i had my car dynoed at 187whp and 132wtq with usdm 4-1 dc header, obx hiflow cat, and 2.5" crush bent piping with some crappy muffler. how much do u think id be able to gain once i get this new stuff on? thanks.