if you go turbo, don't even bother w/ exhaust now, because you'd be replacing everything, anyway. The exhaust manifold (header) is where the turbo mounts, so this obviously needs to be replaced w/ a turbo-ready unit. also, the optimum exhaust piping size for turbo'd hondas is 3", but if you bolt this to a naturally aspirated motor, you'd loose ALOT of backpressure, and torque.