Just something I found that might be of use to someone:

http://images.magnaflow.com/07techtips/pdfs/16820.pdf

Nice layout with the X pipe. Looks like 2.5" dual pipe.

 

I have something similiar on the way....BUT its true dual exhaust. I got it from Hector at exhaust depot. It seems that he's making some damn good y pipes and I opted for the whole system when ordering the Y-pipe. I will see what gain the full system will put down. The full exhaust goes on this weekend with a COBB tune. Call him or vist him on the web.

Good luck