'83 1100LTD pipe/air cleaner question

OK, so my new-to-me '83 1100LTD has 4-into-1 exhaust, and individual K&N type air cleaners - are these primarily cosmetic add-ons, or do they really improve performance over OEM parts - and if so, any best guesses as to how MUCH improvement over stock?

nice looking 83

The pipe would add a few ponies, and there is huge debate on the Pods. If there is a performance gain, is it worth the trouble tuning, etc. Those CV carbs, with the Pods will show there weakness on a windy day. get a side wind across the road and try to get it to pull a corner or hill.
Do a search on them, Pods, just make sure you have an extinguisher handy for when your computer melts down. :laugh:
If you ride on nice days, then they can be tuned to run, some get them pretty good, they say.
A lot easier with a VM mechanical slide, but the other problems still exist.

Off subject: you have a nice spot there in John Day, I just rode through there last month. CO, to Bend, then Seattle, and back. Pipe yes no Pods.