AVO Turboworld's Gen 3 Muffler System for 2015+ WRX 4 Door Sedan offers improved flow and a deep, smooth sound.  The Twin Mufflers are constructed fully of stainless steel with 63mm (2 1/2") piping from the y-pipe section.  The quad 3" exhaust tips finish off the rear of the vehicle and the dual tips fit well into the middle of each bumper cutout like the standard setup.  The tips are adjustable so that you can customise how far you want the tip sitting inward or outward.  These are very high-quality pieces, perfect for that classy look and enhances the boxer burble while improving performance thanks to the freer flow.