Does our engine have the ability to rock backwards, in order to get more space to do a Front PEM install?

I would imagine a slight distance with the motor mounts attached....Pull the front mount and you maybe able to get a little more room?

Doesn't putting a PEM on just the front create some kind of imbalance in the engine?

I know it can go forward, but I've never seen it go backward. I'm sure it can be done.

You should have plenty of space to do the front. I had a lot of room in my engine bay for the front PEM, and I have a smaller car than yours.

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Not really, if you compare the front cast small exhaust ports on the manifolds to the rear tubular ones, stock it would seem like they are already inbalanced.
What i'm trying to say is the front manifold is crap and it shouldn't harm it.

The front isnt too bad to install/remove, it'* the rear that will make you curse. Theres a mess of brackets you have to remove to get to all the studs though.

The front was a pain, but easy enough to do. Just a lot of bruised knuckles. I still cannot get one last stud in, but with no exhaust leak, i will wait till spring to mess around with it.