[E55 KEV]

Thanks for the write up. In another Exhaust thread I posted this. Seems like DCX is calling the dual rears the resonators. It is strange?:

This is what was published in the Road & Track Special Series Guide:

“Downstream of the engine is a true dual exhaust with closely coupled catalyst that light off quicker in order to reduce cold start emissions. Each bank empties into a 2.5-in. exhaust pipe and both converge in a center X-pipe that allows communication between the two banks of cylinders. This not only helps with scavenging exhaust gases, but also makes tuning of the exhaust note easier – no small feat in an engine that operates in both 4- and 8- cylinder modes. The exhaust pipes travel through a large muffler that has 2.25-in. paths, and then exit into two resonators and 3.0-in. chrome exhaust tips.

“One of the significant challenges with MDS was to give the car a throaty exhaust note that is sustained through the transition to 4-cylinder mode, “ … “We did a lot of development with the exhaust system to come up with a sound we liked.” “