These Mercedes CLS 550 BiTurbo down pipes are among if not the best made down pipes you can get for your CLS 550 BiTurbo. Made in the USA and out of 100% 16 gauge stainless steel, using 3 inch tubing. These CLS 550 Down pipes are built to last. These down pipes are the key to unlocking the hidden power in your CLS 550 BiTurbo. The kit includes all the hardware and clamps needed to get the job done. Options are available for an H-Pipe or X-Pipe. We can even fit a set of high flow cats into the system.