You can probably do this repair youself. Get some liquid wrench or equivalent and spray the crap out of every exhaust fastener on the exhast mainfold and exhaust pipe flange that connencts to the exhaust mainfold. You probaly have exhaust mainfold gaskets that must be purchased at the dealer or here at Fastlane. Try and loosen the bolts after spraying with liquid wrench. It they dont budge keep spraying and soaking with liquid wrench. If they wont budge take it to a pro. You don't want to break of one of those bolts.
I also would suggest to carry a working carbon monoxide detector in your car temporarily until its fixed so you know if you are safe.
1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T