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Not possible you would have no leverage or space to do so
I managed to change the motor mounts on my W208 without pulling any part of the exhaust. The W209 may be a different process.
I removed the transmission mount and jacked up the engine from the oil pan using 2 blocks of wood to cushion the lifting point and distribute force. After raising the engine about 5 inches I had plenty of space to access the top bolts on the motor mounts.
When I changed mine at 105k the drivers side mount was torn and had dumped out most of its fluid. The passenger side mount was cracking and beginning to leak. The transmission mount appeared ok visually but for $27 for Lemforder I changed it anyway.
I also had the drag link out which made the lower bolt on the motor mounts easily accessible with a ratchet. The drag link was by far the worst to remove. I had to use a pickle fork which worked on the outer tie rods. The two inner bolts took a truck bearing puller to get loose since I didn't have the Mercedes tool the WIS called for.
I replaced the motor mounts today on the W209 without dropping the exhaust,
Ended up loosening the steering rack and cooling lines along with the stabilizer bar. Drivers side was very tight but was able to wiggle the old one out and get the new one in, passenger side was very easy. I used a low profile snap-on 16mm socket along with a stubby gear wrench, doubt if I could have done it without those 2 tools.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
