RM Motors is a quality-proven manufacturer that supplies downpipes and exhausts in super good stainless quality (304). When you receive a downpipe from RM Motors, you can see with certainty that they are made in good quality and the welds are perfect. You can get downpipe with and without catalyst - You can choose between different models of catalyst. If you buy a complete exhaust from RM Motors, it can be mounted without making modifications - Mounted as an original exhaust.