With 700 + HP you need your engine to breath! We cut out the smaller exhaust with 4 mufflers and increased the pipe size to 3 inch. Installing Rich’s Exclusive Race Demon Performance mufflers as well as 3 inch tailpipes. This is where other shops fall short they install 2.5 inch tips onto the 3 inch tailpipes and restrict the air flow which defeats the purpose of larger exhaust. Ours our 4.5 Boss tips with 3 inch inlets, done the correct way by a true exhaust fabricator. Offering upwards of 18 hp gain and over 1.5 mpg! The active valves we taken out and an electric bypass chip was installed. This Hellcat is vicious and so is this amazing exhaust work. Done right by the West Coasts Premier Exhaust Center !! RICH’S