I tried searching, couldnt find anything.

Where is the differences in the exhaust design on the 07 vs the 06? (after header)

 

07 has a longer header design, shorter cats and an extended Y pipe. any exhaust will attach to an 07 car cat back, an 07 exhaust will not fit any previous years afaik

 

Agreed...

07: better header design, smoother y-pipe design, the rest of the exhaust is pretty much the same

 

cats are built into the headers? I forgot.

so after the headers back, ( Y pipe to axle back) from an 03-06 will fit an 07?

 

Yes but why would you put a 03-06 on a 07?

The Y pipe also has vibration isolators.

No the headers are not built in.

 

Here I took a pic for you. Two vibration isolators and you notice the Y is straight until the mid pipe then joins just before going into the mid pipe. Much smoother flow.

 

Here is another looking back from the CAT

 

what do the vibration isolators do? how does it work? I wonder if it would be worthwhile to put them onto an aftermarket exhaust if it reduces any vibrating.

 

thanks guys, im asking because I am looking at the bassani catback but only showed it listed for an 03-06

 

It works by counter balancing the vibration. It would be to much work to weld them on an after market exhaust. The rubber is weighted and suspended off of the bracket. When they vibrate the rubber shakes at a different speed than the exhaust so they balance out or delete every other vibration. = smoother.