[Markukus]

On this car the exhaust is in two sections, the front three cylinders using one manifold, and the rear three another. The rear flange is loose, and I can't really see a way to get to it easily.

Does anyone have any suggestions? are there any special tools required? is this something I need to take to an exhaust shop?

 

[Takernz]

Is your car a Euro version? I have same situation as my 280S W116, they're 3 bolts are holding in each flange, but the innermost bolt that facing the block is pretty tough to access, I used 2 combo 13mm wrenches (1 for holding while the other for turning a nut), or 2 vice grips if you round the bolt heads or nuts or both (but you have to replace those rounded or stripped bolts and nuts with new ones) spray first with penetrating oil like WD-40 then I loosen up a bit then tightening them back. The job was relatively much easier because of W116's engine bay is huge and much room to get into while the W114s 280's are much cramped to work on.

 

[Grubeguy]

When I had a 114, I used a bunch of universals and extensions...