You may want to check out 190Revolution.net's forums. Since the M103 was shared between the 190 and 300! There is a guy there named MRP-Engineering that does custom work for these engines. He does have flanges for custom headers for the M103 motor and may even have full manifolds already made. He just had posted yesterday about making some custom exhaust headers for the M103 out of the remaining stuff he has in his shop. He also is quite knowledgeable about the tuning of these engines as he has done much work.

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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....