Back pressure is reduced producing power gains. Sportex performance exhausts are constructed using aluminised steel for the pipe work and silencers and T304 polished stainless steel for the tailpipes and are backed up with 24 month guarantee.Sportex performance exhausts are MOT/road legal are designed to fit to the standard system using the cars original mounting points and clamps. It may be possible to fit this exhaust with other exhaust brands or to other similar car models but we can only guarantee a direct fit to the exact model as shown above. UK mainland excluding Scottish Highlands. Sorry we do not export. The item "Sportex Vauxhall Astra 4 SRi GSi performance back box" is in sale since Monday, November 17, 2008. This item is in the category "Vehicle Parts & Accessories\Car Tuning & Styling\Performance Exhaust\Other Performance Exhausts". The seller is "performanceexhuastsdirect" and is located in Co Durham. This item can be shipped to United Kingdom, Ireland.