The Supersprint headers are among the best on the market for making the most top-end power on the M50/S50US engines. These are a long-tube equal length design which maximizes airflow for excellent power gains. On their own these can be good for 12-15hp. With a custom dyno tune you can expect even more power! These are the real deal stainless steel headers with beautiful construction and design (often copied for cheap auction sites but made from mild steel vs stainless steel).
Supersprint exhaust is widely recognized as the leader in complete exhaust system upgrades - extremely high quality, well designed for optimal flow, and amazing sound. Even at a premium price Supersprint is an unbeatable exhaust design because every aspect is done to such a high level. Most Supersprint systems are built with larger diameter piping to improve exhaust flow which helps the engine do less work and make more horsepower! Supersprint exhausts generally run at a premium over other systems but no other system on the market can match their quality, performance, or reputation!