the only thing i kept from mine was the tube, i hooked that up to the factory air box (because i was running a snorkel so, CAI and snorkel dont mix...) and i acutally gained a few mgp i would only typically maybe get like 200-220 per tank and now im getting like 24-250 a tank and thats with the stock air filter too... i did run the k&N drop in filter for a while but it was too much of a hassle to clean them as much as i was having too, spending so much time on dusty back roads they would clog up fast, and i have 3 of them... i just use the factory drop in now -they are cheap enough