Ok a little update:
It has come to my attention that there is in fact a leak on both the front and rear banks. It is at the flange between the header and collector sections. On the front header I was leaking on the front side of the flange. On the rear it was also on the front side of the flange.
I have some "exhaust leak" stuff from oreilly that I smeared up on the front in between the gap and it sealed it up nicely. Will be doing the same thing to the rear in the near future.
All in all, now that I've driven the car a bit, I still cant speak to if there has been any real performance gains or not. I hadn't driven the car for a while before doing the swap but I can say there is certainly a very noticeable sound difference.
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