Just wanted to know if putting performance parts on a 184k mile Honda Accord Ex Coupe F22B1 would be bad? I.e catback exhaust, cai, headers, etc.
I have already replaced spark plugs, wires, air filter to a k&n, fuel filter and just got an oil change.

 

If you use quality proven parts, nope.

 

It's really not worth it if you're expecting to make it fast. The engine isn't designed to make power with bolt-ons like the B16, B18, H22, K20 can. The internals of those engines are necessary to make power with supporting mods. The F-Series are designed with economy in mind. Now if you crack open the engine and change the internals, you can make power.

I put an AEM intake just for the sound to make my daily driver more fun. I have an aftermarket exhaust on it simply because the old one fell off. I might have upgraded it to a aftermaket piece but, again, not expecting performance gains. Just for the sound. It made it more fun daily driving.

 

It would be prudent to first check the engine compression to determine the health of the piston rings/valve guides before putting more stress on the engine. Granted breathing mods arguably put less stress on the engine.

For the filter, get a proper CAI with a cone/pod filter, and ditch the K&N drop-in. I've never seen a test of a drop-in filter on a 4-cyl making more than a 2% horsepower gain, and you lose alot of filtering capability compared to a Wix. If you're going to let fine dust into the engine you might as well increase the surface area of the filter and get a nice, big, smooth pipe to carry it.