Invidia 08-09 WRX Sedan Q300 Dual Stainless Steel Tip Cat-back ExhaustDescription: Q300 Exhaust Piping: 76mm Tip: 110mm Tip Style: Rolled SS x2 The Invidia Q300 Exhaust features a flat bottom shaped muffler design results in improved high speed aerodynamic performance. The muffler inside contains continuous piping design and use of Advantex material that results in an excellent free flow exhaust with optimized back pressure, giving greater horsepower, torque gains and a rich deep sporty sound. The use of SUS304 polished