Exhaust comparison question

Offdutyz

I'm a newb here and been doing my research. I want to get a CBE with possibly a HFC. It seems like the most popular CBEs are the Invidia Gemini and FI TDX. I've done numerous YouTube video searches but can't get a good feel for how loud and deep each of these CBEs are. I'm looking for something deep opposed to loud and I don't want the annoying hiss or at least keep it to a minimal. My Z is used more for pleasure but is a "commuter" when I work (drive to work the first day but its left at work until the last day of then it's driven home). I know exhaust will cause drone but I want it to be minimal. I would choose to go with the 18" resonators if I go with the FI TDX.
So here are my questions...
Between the Gemini and TDX which would be louder in the sense of just being loud?
Is there a scraping issue with either one? I plan on lowering the Z with either a coil over system or the Nismo setup.
For the FI TDX is there a sound quality difference when choosing either SS or CF for the mufflers?
I noticed from pictures the Gemini tips stick out a bit. Is there a way to make them flush like stock?
How flush are the FI tips to the bumper?
Between the two which produces a more unique exhaust note?
Is the Invidia HFC resonated? Is the FI HFC resonated?
Are the power gains comparable or will one of these produce more?
For the ones with GF/Wives what system do you have and does your significant other complain about the exhaust set up you have?

Thanks.