I've driven both a C220 and a C230 Kompressor model.
I didn't find the engine note of a C220 or C230 thrashy sounding at all.
However (comma space) every road test review of every Kompressor model has included comments on how rough sounding the compressors are.
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".