These Mercedes CLS 63 AMG BiTurbo down pipes are among if not the best made down pipes you can get for your CLS 63 AMG BiTurbo. Made in the USA and out of 100% 16 gauge stainless steel, using 3 inch tubing. These CLS 63 AMG Down pipes are built to last. These down pipes are the key to unlocking the hidden power in your CLS 63 AMG 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. With tuning gains can be well over 100 wheel horsepower and over 200ft lbs of torque!