This bumper is designed to be used with 9" wide front fenders or turbo width. The oil cooler opening is 23 1/2" x 6 1/8" and includes brake cooling ducts and a built in splitter. The bumper also includes mounting hardware and NO provisions for lights so this it is very light for track duty! Fits GT Racing Part #30b. Average weight is 6 lbs. Note: GT Racing also recommends buying the grill (part #43C) or for extra downforce add an additional splitter/under tray (part #44C). Approximate weight 10lbs. Call for carbon fiber prices.