The Invidia Q300 is a stock looking exhaust with a high flow muffler. It includes a midpipe, 2 gaskets, an axleback and all the hardware needed to install this on your WRX or STi. The Q300 is made from a lightweight 76mm mandrel bent stainless steel. These exhausts are extremely subtle whether that's the appearance you're after or your sick of getting hassled from the police. The piping is large coming in at 76mm, this is to free up some space for those exhaust gasses to go unlike the stock super restrictive system. The tip with all of its "subtlety" comes in at 101mm providing for a pleasant appearance.