Purchased a 2005 cl600 and just wondering if any knows off the top of their head if the diameters are different. I know the 600 has resonators but not sure if the mufflers are the same. The reason I ask is because I have the stock 65 exhaust(cats to mufflers) still in my garage, and if the 65 diameter is bigger i'll just swap from the cats back. This 600 is waaay to quiet. If I decide to keep I'd like to go catless with no resonators or mufflers. Figure I ask first before crawling under the car. Full mods+big turbos+100shot are running around in my head

at least for a W220 S class it is different. It goes from dual to singe back to dual before the resonators.
This past weekend I put 3 inch piping all the way back from the turbo flange and I felt a loss in low end tq. So I put the mid section back on and left the cat less downpipes on the car.
If you go cat less the leave the mufflers on or else it will sound like a truck.

They are different, JAYCL600 measured his old CL600's vs my old CL65 and it was I believe about a 1/4" different in the piping. I think he posted a thread on it but I can't find it.