GReddy Racing Ti-C Cat-back Exhausts combine the design, looks and flow of our Full Racing Titanium systems with the durability, deep sound, value and large application list of our other Stainless Steel street systems. This fusion of aggressive styling and practical construction, makes this the logical choice for both Race and Street Enthusiasts. The systems are comprised of a Titanium heat-treated tip, polished stainless steel muffler, unpolished stainless steel piping. It improves high and mid-range performance while still allowing for suitable sound levels when used with the included tuned Tri-mounted Silencer*. *Most applications below 92db, with all under 94db. The large list of applications include 80mm piping for Turbo applications and 50-60-70mm for Normally Aspirated vehicles. (usually 60mm)