mountune has been engineering exhaust systems for numerous years with the objective towards increased power and response paired with an enhanced exhaust tone and sleek and stylish appearance. The mountune 2013-2015 Ford Focus ST High Flow Cat Back Exhaust system is manufactured from 2.5” AISI 304 stainless steel mandrel bent tubing with dual 3.25 double walled, polished stainless steel tips. A Helmholtz chamber design is used in the rear muffler to cancel out any unwanted frequencies. Although this system is more expensive and complicated to manufacture, it ensures that back pressure remains low while increasing performance with little drone. All mountune muffler assemblies are robotically TIG welded AISI 304 stainless steel for long life under extreme performance. The diameter of exhaust tubing has a major impact on sound quality, mountune used careful consideration for each size and performance. The High Flow Cat Back Exhaust was built to utilize slip fit connections for easy installation and comes with a lifetime warranty.