These are all the different sedan exhaust setups i could find.

ARK

ARK Performance GRIP Exhaust 07+ Infiniti G35X/G37X AWD Sedan Prototype Sample Sound Clip - YouTube

GREDDY

GReddy Spectrum Elite Exhaust - G37S Sedan 6MT from Go Tuning Unlimited - YouTube

TANABE

2009 Infiniti G37S Sedan RWD 7AT Tanabe Medalion Exhaust Tanabe NF210 Lowering Springs - YouTube

TANABE WITH KINETIX HFC

2010 G37 sedan Kinetix HFC's w/ Tanabe axle-backs - YouTube

 

MUFFLER DELETE

MEISTER SHAFT

FAST INTENTIONS

TOP SPEED

 

STILLEN

HKS

 

INVIDIA

RESONATOR DELETE

MOTORDYNE E370

 

reserved

 

reserved for more

 

And last one

 

Again, thanks for getting this done, great job there.
Sorry guys had to delete your previous comments so we could keep all the room up top. You can now comment again, thanks!

 

I don't have a fly-by, but here is a stationary comparison of the 6MT Sedan, both with the Fast Intentions Resonated High-flow Cats.

First half is RHFC + OEM catback, second half is RHFC + FI 2.5" CBE w/18" res.

 

Here a sound clip I did a few months back. I'll do a couple more soon.

 

Don't mind the compressors and air suspension noise

 

Found another one

 

I had asked which of these work for G37x

 

Ark, Stillen, Fast Intentions, Tanabe, TopSpeed. Any sedan exhaust will technically work, you just need to make sure the Y-Pipe clears the AWD transfer case, if not you can get it modified pretty cheap at an exhaust shop.

 

Tanabe is just an axleback so you should be fine but Ark and Fast Intentions have catback exhaust set ups for the AWD sedans or you can do what ZahyMatar just suggested and have a muffler shop customize the y-pipe for you. Or get a catback sans the y-pipe?