The Borla(r) Axle-Back system for the 2.4L 4-cylinder Toyota engine (PN 11743) delivers a 200+ cfm increase in flow and better than a significant weight savings. The Borla(r) tC system incorporates 2.25" diameter lightweight yet durable aircraft-grade high quality T-304 stainless steel tubing with CNC mandrel bends and a straight-through free flowing wide oval muffler. It sounds awesome and is capped off with a stylish oversized Borla(r) embossed polished T-304 stainless steel oval tip for a sharp appearance. Sound, performance and looks with an easy bolt-on installation. The advanced engineering Borla(r) incorporates into the Scion tC is based on a long history of Toyota exhaust from racing both cars and trucks. Current NHRA sports compact standouts Titan Motorsports rely on Borla(r) for their Toyota race and street car exhaust. Borla(r), your brand for over 40 years building great sounding performance exhaust backed by an unbeatable million-mile warranty.