TurboXS RFL TI Axleback Exhaust for the WRX and STi is a loud titanium tip muffler for the WRX & STI designed to bolt to a stock midpipe or Turbo XS stealthback exhaust. The RMA-TI muffler features a 3in inner-diameter muffler with 4in titanium tip. The tip has a blue burned look, that looks great and is a nice finishing touch. This is a loud cannister muffler. The muffler is 3in, but features Turbo XS's unique dual-bolt pattern to adapt to a stock 3in midpipe with no leaks!