Gibson 11-14 Ford F-150 XLT 3.7L 4in Patriot Skull Series Cat-Back Single Exhaust - StainlessThe Patriot skull Exhaust is the complete opposite of what Gibson has normally done. Sonically we bring your Ford F 150 a sound that's more aggressive, powerful, and brings your 3. 7L engine to LIFE. Aesthetically, the Patriot Skull is edgy, fresh, and has an attitude you can't overlook. The Huge 6 inch Black Cerakote colored Exhaust Tip gives it a look that embodies a lifestyle on its own. We're certain with the addition of our new Stainless Steel 4