What's the difference
 

Between:
- AAM Competition 370Z S-LINE Short Tail Exhaust
- AAM Competition 370z 2.5" Resonated Test Pipes
- AAM Competition 370Z S-LINE Axleback Exhaust

and all the aam options?

Not to be rude, but that's like asking what's the difference between an apple and an orange.

Here's a link so that you can see what each piece is.

AAM Competition - Nissan GT-R, 370Z Turbo Performance Specialists

Diagram of exhaust terminology.
https://www.redline360.com/garage/wp...er-exhaust.jpg

https://dfvv2uachi3f1.cloudfront.net...t_06.18.11.png

so if I understand right:
From engine to back of car
AAM Competition 370z 2.5" Resonated Test Pipes then it goes to
AAM Competition 370Z S-LINE Axleback Exhaust then goes to

AAM Competition 370Z S-LINE Short Tail Exhaust

???

No. The test pipes replaces the cats.
The short tail exhaust replace the muffler.
The axel back is basically the muffler section.
You would have either/or the axel back or short tails.


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so if I want
https://www.youtube.com/watch?v=yJevZQsiO4A&t=22s

I need:
AAM Competition - Nissan GT-R, 370Z Turbo Performance Specialists

Yes. You want the short tails.