Why increase boost?!? Why not make power elsewhere?!? High Flow Catalytic Converter (or "Test Pipe"...basically, a piece of exhaust pipe that's custom cut & prepared to be swapped into the PLACE of where a catalytic converter SHOULD be)...& that's just if we're talking on something you need to drive as a daily driver, if we're talking organized track/drag strip/whatever, then justy open up those headers (in THIS context) Headers & Exhaust Manifolds are the same thing