hey, when i still had my stock pipe on my pro .15 i melted the baffle inside the pipe so i cut a circle out of teh bottom of a pop can(stronger) cut it a little smaller than the pipe opening and used that as a baffle, i drilled holes in it, there wernt as many so there was more back pressure and seemed to have more power.

i dont think the 2.5 pipe is a 2 peice pipe tho. just letting you know there are ideas out there

have fun