exhaust fumes in cabin
am getting exhaust fumes in the cabin of my 1991 420. I had a new muffler
installed. there are no holes in the pipes or any of the undercarriage. All door and
trunk seals practically new. Extended rear exhaust a few inches so it sticks out past
rear bumper trying not to get fumes caught under rear. Only smell fumes when I start
from dead stop at a light. Any thoughts or suggestions?