For WRX & STI owners looking for a complete free-flowing exhaust solution that runs from the turbo all the way to the bumper; this is it. The R and L in the name RFL-TI stand for “really” and “loud,” you can use your imagination for the F. And make no mistake about it: this is an exceptionally loud exhaust. The Turbo XS RFL-Ti Titanium Tip Turboback exhaust starts with a bellmouth downpipe, tapering to 3″ and bolting into a 3″ high-flow catalyst or 3″ race pipe, then into a 3″ midpipe, and ending in a 3″ inner diameter N1 style muffler with a titanium tip, making a complete post-turbo exhaust solution. The large piping diameter on the Turbo XS RFL-TI Turboback make it one of the best at adding power on the market.