I don't know of any aftermarket uppipes (unless you're counting the International bellowed uppipes for the OBS). Since the D66 is a drop-in replacement for stock, why not just get ne factory pipes? The IH kit is around $800! Cheers!
I would just clean and hammer out old pipes I did in 2009 with Ford donuts and still not leaking. I tried the 2 1/32 from autozone and they are thicker and they never sealed on my truck. My. 02