Right now i am running a 5zigen jdm header to a custom made test pipe and then flowing through a 5zigen fireball exhaust. From what I have read the header and exhaust are both 60.5mm. I would like to see around 200-215 to the wheels(in a long process) I was wondering if this pipe sizing will really hurt my gains compared to the beloved dc jdm header and custom 2.5 pipe.