First I’d like to take a moment to thank you for your excellent work and photos on removing the rear door panel on yer 400. My 400 has something loose in the rr door and I was wondering what the task would be. But have only removed the front panel of another MB to cure rattling wood trim there.
Second, my recollection of the belly pan on the 400 is primarily to reduce noise. It also serves to streamline the air flow underside of the car a bit. From other comments, removing the belly pan will help increase air flow under the engine, and may serve to help cool an otherwise hot running engine.
'00 ML320 "Casper"
'92 400E "Stella"