R-Tec Auto Design have been authorised supplier and installers of Milltek Exhausts since day one back in 2001. Limited warranty promise. Aircraft grade T304 Stainless steeL. Mandrel bent. As one of the UK's best aftermarket exhaust options, not only do Milltek specialise in aftermarket exhaust systems such as backboxes and cat-back exhaust systems but they have fully engineered Race division. If you have any questions related to BMW 1 Series 118d Milltek Exhausts just ask!