I never thought it'd be this hard but,

I have no clue which exhausts to get.
I narrowed it down to two.
Nismo and Stillen.

I didn't want HKS or something else because the tips for me are too big or the mufflers behind it were too obtrusive. I felt nismo and stillen were the candidates I want.

Both of these exhausts are up for sale locally through a couple guys I've gotten in contact the past couple of days and I am really at a loss for which one I want.

Basically my guidelines are:

1. try to keep it as stock looking as possible
2. have a nice deep 'muscular' sound to it.
Not high pitched like some other G35's exhausts.
3. a nice gurgle like the srt-4 (yes I know that comparison issue) with that "vrom da da da da dom dom dom " sound
4. best power for NA
5. best sound overall.

my car is 5AT.

I know the nismo is with a ypipe and the stillen is true dual.

Which is your take on what's best?