With this system, we decided to make our own high flow Air Box instead using the much restrictive stock unit that comes with the bike. With our high flow box matched with our high flow intake tube, this intake surpasses anything on the market when compared. Unique tapered design to create velocity.Increased horsepower and torque across the rpm range. Works with stock air box & all aftermarket shocks. 2 Bolts and 2 Nuts for Subframe. If your YFZ450R has an AIS delete kit installed we recommend purchasing the 09-14 intake. ATV Galaxy is an authorized FCI dealer located in Irvine California. Listing and template services provided by inkFrog. This item is in the category "eBay Motors\Parts & Accessories\ATV, Side-by-Side & UTV Parts & Accessories\Air Intake & Fuel Delivery\Air Filters". The seller is "atvgalaxy" and is located in this country: US. This item can be shipped worldwide.