Difference between the v2 and v3 ART pipes?

I believe it's just brackets.

How in the world did you manage to reach and get the very top bolts out on the factory CATS ??? Almost no access to them especially the driver side. 45min you said, and you did that on the ground!!???? It's the worst designed access for CATS ive done. Impossible to get them without 2+ foot extension which you gotta use from the engine bay side

Yes, that would be how you do it.

I wish someone would say something about it in the installation thread. I never came accross this info. 2+ foot extension is not something many people have and even techs.

Anyone know if these ART pipes will work with either the FI TT 3" exhaust system, and the AAM TT Kit?

I have a set of motordyne art pipes installed in my 09 370z and was wondering if its normal for the car to make a hissing kind of sound after letting off the throttle. started happening after I installed the pipes and did not find and leaks when i felt around them.

Yes, it's normal.

My flex pipe broke with my current setup AAM Comp TP + Beluga Y + Beluga Catback