Your engine has the best intake manifold ever designed, its so effective in boosting torque that it negated the need for using variable cam gears. Yet and even with the compromised 3 valve head the engine still made 10 hp more than the M104 3.2. I see this intake to live as long as the rear multi link first seen on the W201

Its simply good but i dought its anywhere close to offer any acoustics worth hunting.
meaning to say what gives an engine its note is how the runners are tuned, look at Alfa V6 engines.

What ever u endup doing just make sure u keep the cold air feeds for the also offer some ram air benefits

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Jay,
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-1995 Blue W202 C36 AMG (M) SOLD ;(
-1995 Black W140 S500 (Lady)
-1992 Black W124 E300 (Dima) (Ex-Mosselman
Twin turbo Kit).
-1988 Black W124 300 E 4-Matic.(Nadeen)
-1983 Brown W126 500SEL.(Old Lady)(Sold)
-1981 Gold W123 280CE.(Dareen)(Sold)
http://www.youtube.com/user/jayrasheed