Is either one better? Does one fit better or thicker than the other? Are the ones for the z, coupe and sedan the same one? Thanks for the info.

 

I don't think you'll find a significant difference between the two.

The discontinued Cobb tubes were the thickest.


Yup.

 

Answered, they are the same for both cars and no difference other than the name I have Z1 tube- Same thing :/

 

Do these tubes make any difference? Does the sound change, can you feel any difference or is it just to dress up the bay?

 

This is a topic that have been discussed at length here and over on the 370 boards. I'd suggest searching, since there is a ton of info on this topic, such as in this thread:

https://www.myg37.com/forums/g37-sed...-vs-stock.html

I run Cobb post MAF tubes and aFe drop ins with the hood line removed

 

You had me as "dress up". That's all the justification you need, right there.

Everything else (sound, performance) is so minimal, if at all, that it's more placebo than otherwise. And nothing wrong with that, either.