Tomei Expreme Titanium Exhaust WRX/STi 02-07Tomei Expreme Titanium Cat Back Exhaust System; for those of you looking to add performance by losing weight and adding horsepower! This exhaust system has been fully fabricated from lightweight titanium and provides substantial weight savings for your 2002 2007 Subaru WRX STI! This exhaust system has been designed with minimal bends to reduce exhaust turbulence under acceleration which improves throttle response and adds both horsepower and torque.