For extreme horsepower applications, the HKS Racing Muffler system, Constructed of high-luster polished SUS304 stainless steel piping and a 170mm Titanium muffler assembly, the Racing Muffler is the lightest system (40% lighter than the race inspired Hi-Power Exhaust system) and the highest flowing exhaust system HKS offers. The muffler utilizes a slip-on/latch design that mates polished stainless steel piping and a lightweight titanium Muffler assembly. For OFF ROAD USE ONLY!