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For WRX & STI owners looking to keep their stock muffler, or use a different axle-back, the Turbo XS Stealthback is the exhaust for you. This system includes Turbo XS's 4in bellmouth downpipe, which tapers to 3in into a 3in high-flow cat, and then into a 3in midpipe. Turbo XS's cat to downpipe connection features an OEM style ball-and-socket design with a donut gasket, to allow exhaust movement while maintaining a tight seal.
In addition, the Turbo XS midpipe is full 3in diameter, but has a unique rear flange that will either allow you to install a stock-type 2.5in diameter muffler, or a full 3in rear muffler like the Turbo XS RFL-TI.