Fits 1967-2002 Mercury Cougar Straight Through Muffler-Stainless SM12149-JHPR caps-rotors-and-contacts Larger volume air box (60%

Larger volume air box (60% larger than stock)

3L V8 2001 - 2004 GMC Yukon Denali 364/6L V8 2000 - 2010 GMC Yukon XL 2500 364/6L V8 2001 - 2006 Chevrolet Silverado 1500 HD 364/6L V8 2009 - 2012 GMC Canyon SLE 178/2

6 V8 1977 - 1980 Pontiac Catalina 301/4

97/6 V 1979 - 1986 GMC K2500 3

Fits 1967-2002 Mercury Cougar Straight Through Muffler-Stainless SM12149-JHPR caps-rotors-and-contacts Larger volume air box (60%Street Max, Stainless Straight Through Performance Muffler, 5. 0" x 8. 0" x 14. 0" Oval Body, Aggressive to Moderate Tone, 16 Gauge 409 Grade Stainless Steel, Satin Finish, 2. 25" Center In, 2. 25" Dual Out, Reversible, 3 Year Limited Warranty. Features: Straight Through Design (fully reversible) Improved Horsepower and Torque 409 Grade 16 Gauge Stainless Steel Construction High Heat Thermal Mesh Effective Drone Reduction Aggressive Moderate Tone