This RSR or IROC Style bumper is designed to be used with 9" front fenders or turbo width Porsche 911's (GT Racing part #30B). This extremely popular bumper has an oil cooler opening of 23 1/2" x 6 1/8", brake cooling ducts and provisions for lights. Includes mounting hardware. Average weight 9 lbs. GT Racing also recommends buying the grill Part #43C. Call for carbon fiber prices.