Stainless Steel Muffler Shell. Slip-on Installation. Perforated Core For Consistent Sound. 5 Inch Billet Tip. Enhanced Exhaust Tone. USFS Approved Spark Arrestor. Improved Flow and Performance. Weight savings of 3lbs. Gains of Up To 2HP.; Dyno Proven; Your MBRP performance gas exhaust system has undergone countless hours on our in-house Mustang 1100 AWD-SE Chassis Dynamometer hundreds of miles on road and track and numerous tweaks and modifications to get the most out of your truck. From the vehicle specific muffler design to the fully mandrel bent tubing to minimal bend degree angles your MBRP performance system gets exhaust out fast. An MBRP performance exhaust system is the starting point to getting the most from cold air intakes programmers modules and downloaders.