This cat back exhaust system was manufactured from mandrel bent, T304 stainless steel that has been polished to a mirror finish. They feature a precision TIG welded muffler with reinforced inlets and outlets, and a deep throaty sound. The 2-1/4 inch mandrel bent pipes increase performance and provide exhaust gases a smooth exit from though looking slant cut exhaust tips. This is a bolt-on system that installs after the catalytic converter to keep you emissions legal. Dyno results show typical horsepower gains of over 10 horsepower, or you can use in conjunction with our cold air intake for even more power! Rugged Ridge Cat back Exhaust: Great Sound. Better Performance. This black vinyl storage bag from Rugged Ridge stores and protects the hard top Freedom Panels on 07-16 Jeep Wranglers.