Pypes Exhaust SFM79 Super System 2-1/2" Diameter304 Stainless Steel Cat-Back Exhaust System for Ford Mustang V6 PYPES PERFORMANCE EXHAUST SFM79 11- Mustang 3.7L 2.5in Cat Back Exhaust System Dimensions in Inches (LxWxH): 34.1 x 34.1 x 14.6