I don't know of an aftermarket, but check out this done to an 87 300e.

It's Donald Swinfords car. Look under Ram-Air

http://home.earthlink.net/~asherson

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon - Sold
2006 E350 Wagon - 368 - Dead
2015 GL350 Bluetec - 197U