Borla 21-23 Ford Tremor 3.5L V6 AT 4WD 4DR CC SB 3in S-Type Mid-SectionThis Mid Section features 3" diameter pipes and the classic S Type sound. It fits with either the O. E. tail pipes or BORLA tailpipes 60640, 60640BC, or 60640CFBA. BORLA(r) Cat Back(tm) & Axle Back exhaust systems feature patented straight through and multi core technology to unleash hidden horsepower. Increased exhaust velocity adds power, driving excitement, fuel economy, and the distinctive BORLA(r) Sound of Power respected by motoring enthusiasts