As mentioned above, you can add the clutched fan, I doubt it would help noise much unless it's the fan noise that's specifically bothering you. When revving the nuts off the engine, the engine is what's going to be making the bulk of the noise.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]