Process West 4" Race Air Intake BoxOur 4in race air box system has been designed for extreme power levels. Utilizing the area normally occupied by the battery we have been able to design the ultimate high horse power intake. The air box uses a massive 6in internal diameter K&N filter which mounts onto a 6in to 4in bell mouth which connects to a internally wire re enforced molded silicon hose down to the turbo. This combination gives maximum flow for power levels of 500rwkW+. The air