Those mods require some more power to really come to life.
You will not realize the full gains of an aftermarket impeller without the added power of a pipe.
About the pump cone - if it's the stubby cone for $50 or so, you won't see much gains at all.
If it's a TBM cone, or R&D, then you are probably just loading your engine down without more power.
Do what you want, but those mods make very little sense on a stock pipe. The stock exhaust is horrible.
You would be better off with an aftermarket pipe and no other mods vs stock pipe and your original list.