guys n girls!......I have a powerflow zorst on me RSI, now its got the box at rear then pipe work to two other round tins and then into the manifold, forgive me but as I asked them to remove the cat, do i have a straight through system? or does straight through mean "nothing other than a pipe from back box to manifold" and there for am I loosing back pressure and power? please enlighten me, as im considering a Prima Racing cat back system or one with a cat replacement pipe. Thanks