In order to function correctly and provide genuine performance gains, any performance exhaust system must have optimised pipe lengths and diameters, smooth even radii at all bends, and carefully blended joints (especially at the all-important collector) in order to maximise gas flow. For appearance's sake and in the interests of durability, the welds should be smooth and even. Needless to say, any good quality exhaust system should be manufactured in stainless steel for longevity. Raceline's exhaust systems for the Zetec-R Caterham and Westfield applications fulfil these criteria... and more.