Hi Will,
I fitted a genuine C36 box, and on mine there is no difference whatsoever. Maybe different on C43 boxes.
However tyhe c36 and c43 rear boxes are identical in outer appearance apart from tail pipes....dunno what the difference is inside though.
Hi Vij,
Have you got the part number for your box? The reason I ask is that they made an 'accessory' AMG exhaust which looks almost identical to a C36 box, except that it's more heavily baffled and uses a slightly smaller bore of pipe. One of the members on here had it fitted a few years ago, and reckoned the exhaust note was almost unchanged.
FWIW, the original C36 boxes part number was HWA 202 490 04 (that's the one that I used to have )
Will