If you're happy with the oem AC look , your good there. It delivers more then enough air now. The V&H fuel pack might be a better choice then the street tuner. The ST won't break compliance.
I went with the HD SE chiseled air intake.
Easy on, easy off.
Looks great on these bikes.
I also went with a full V&H setup.
Twin Slash 4" V&H slip-on's
FP-3 Auto tuner.
My post is on this V&H FP-3 Auto Tuner.
A great product by V&H.
If your not aware of the FP-3, read up on it.
It works fantastic.
When I added HD SE 255 cams at my dealership, before I left the dealer, I updated the map on my bike from my phone and the bike was ready to rip.
I then did a 200 mile ride the next day and Autotuned it using my phone.
Lots of good data was retrieved by my autotune program and then I flashed my bike with that data and my bike has never run better.
Your bike will thank you by doing a full stage one.
Definitely need to gut the catalytic converter or go with a new head pipe.
The bike will be more unleashed.
The bike will also run a little cooler.
Let us know how it all turns out.