I built this last year and have not dynoed the car or raced it yet (I ran into some cylinder head coolant leakage which stopped the project).

I bought a set of Kook's headers and with running a Spohn TA and KBDD sub frames, I was concerned with how it go together.

Anyways, this is what I built last year and was wondering if anyone dynoed before and after with something similar and then going to an x-pipe setup.

http://www.putfile.com/cantonracer/images/105520

 

How low does that exhaust hang down? It looks good, but I would honestly say that if you went with an x-pipe setup you might see a couple horse power, probably not really worth it unless you want the sound. It will help a little and it does sound better IMHO with an X, but your setup is pretty clean and I'm sure it flows well.

I might have some pics up of my home fabbed X with flowmaster super 44s and spohn tunnel mounted TA in the next few days if everything goes well if that will help you at all.