I'm going to have the differential out to install some bushings. Anything you guys recommend I do while I have this thing out? Anything you'd recommend I do to the subframe while that is out? This is a 2005 AT coupe. Daily spirited driving. No racetrack stuff.

 

A Nismo or Z1 diff cover would be a simple thing to do while it's off. Plus obviously fresh fluid. Not much else to do unless you're going deeper into mod territory.

 

Subframe collars if you want it even stiffer. You can always do that later though since it doesn't need to have the diff removed.

Spray any rust with under carriage spray.

Check your rear wheel bearings and the rest of your rear suspension bushings.