Gungrave

So I've been looking around the forum and haven't been able to find the answer I'm looking for. I currently have a 2010 base Z and my current mods are a K&N short CAI, ARK Coilovers and FI catback exhaust with 12" resonator.

I'm not really looking to make my Z stupid fast or extra loud, I have a Busa for that, but I do want a decent sound and a little extra kick. I already have the sound from the catback exhaust, which I love by the way. In the somewhat near future I'll be getting the Stillen Supercharger kit and I wanted to make sure I wouldn't have any issues down the road with my current parts.

So my question is this, would the supercharger kit have any issues with either the stock headers and stock cats. Or would it be more beneficial to keep the stock headers, but install the FI High Flow Cats. Or should I just go with the FI Long Tube Headers?

Again I'm not looking for massive gains from the upgrades, I simply want to make sure everything would jive nicely. As of now I'm starting to lean towards keeping the stock headers and install the FI High Flow Cats. Plus I doubt getting the HFC would reduce the sound of my current exhaust.

Do you guys have any thoughts on which route I should take?