I'd go to a full exhaust. A 45T rear sprocket will be a noticeable change and I think you can do that without going to a longer chain. A quick shifter is a great mod.
I'm not sure what you mean bu the PC being turned down. It's either connected and working or it's disconnected and not working. A PC3 is fine for now but you may have problems finding maps now since everyone gets PC5.
The race filter won't make any real change in performance--it's a minuscule improvement and UMO, not worth the risk to reduced efficiency in filtering unless you are racing. The Voo dos will be loud and lightweight but no real improvement in performance. THE HEADER is still there and thats the performance factor. Color-Right has a good frame color that matched but lacks enough metal flake. It should be fine for the frame where it is not visible but won't match the slight glitter in the OEM frame color. Also must be applied properly---thin or it will look black. There was another paint manufacturer that does OEM paint copies and I hear they are better for color match. I can check for you if interested.
'08 MIDNIGHT SAPPHIRE BLUE Now Deceased