Mods are as follows:
-Cone filter
-Cobb turbo inlet
-3" Downpipe
-Test-Pipe
-3" Agency Power Cat-back
-Tune
-Exedy Stg. 1+ HD

I started my X's journey with the goal of a budget build to experiment with the cars potential power output, not to mention saving some cash in the process. I got the downpipe and test pipe for a great deal ($120) and I picked up the catback from a rolled X (catback only needed a couple welds from where the factory welds on the Y were broken and only set me back $200 and some time to spot weld it. I love the sound and couldn't be happier with the free flowing system but after hearing another set-up I am inclined to switch.

I am considering going with the Cobb catback. Here in turn is my question:

The Cobb system is a 3" system with a 2 chambered muffler, my current set-up is a flow through system with no restriction so. . .will replacing the system alter my exhaust flow characteristics enough to require a modification to my tune? I haven't been able to find any information in CFM flow either one to compare the Agency Power to the Cobb.

I know there are a few threads on this subject and generally, swapping catbacks has little to no effect but I wanted to be certain and get specific information on these two specific systems.

So whats up?

 

You shouldnt need a re-tune, just a switch of the catback wont change things much if at all.

 

I agree ^

 

So any other exhausts sound comparable to the Cobb...I enjoy the gurgle and low exhaust tones...my Agency Power is getting old...