Right now I'm testing
 

Right now I'm testing headers. If I can find someone with a crx will to let me borrow their exhaust for a few hours I would be very willing to test other exhausts also, but I don't have the money to purchase my own right now. I am assuming that a good starting point will be to find the best header and base the exhaust dimensions/flow characteristics off how the header functions, but hell if I know for real.

Update at orginal post above.