These Mercedes E 550 BiTurbo down pipes are among if not the best made down pipes you can get for your E 550 BiTurbo. Made in the USA and out of 100% 16 gauge stainless steel, using 3 inch tubing. These E 550 Down pipes are built to last. These down pipes are the key to unlocking the hidden power in your E 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.