GReddy Racing Ti-C Cat-back Exhaust for your WRX/STi combine the design, looks and flow of Greddy 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.