AVOTurboworld's Gen,3 Front pipe for the FB Series Impreza 2.0i & XV 2.0i 2012-2017 models offer improved flow and a deep, smooth sound. The pipe section is 2.5" and it includes a 5" body cat converter and is 2.5" stainless steel all the way through to the next factory join. AVO uses the OEM style donut gasket for the flex without the donut gasket and OEM spring loaded bolt setup then your headers and any welds forward of the flex are prone to cracking. The stainless are 10mm thick and will not warp under the harshest of conditions. The thickness of our exhaust tube is 1.5mm which is thicker than most aftermarket front pipes. This helps with noise absorption and with longevity of the product.