I need to clean my EGR ports in my Intake Manifold.

I also need to change my timing/balancer belts.

While I'm doing all this in my f22b1 Accord, I was wondering if there was any potential for performance enhancements.

Somebody mentioned honing the intake manifold or something.

Or are these basically just maintenance issues that need to be addressed with little room for performance improvement. But then again, when I clean the emissions system (EGR ports) and put on a new timing belt, I might regain performance that has been lost over the 165k mile lifespan of the car thus far.