That is why Im patiently waiting for Ace to start selling all the Performance goodies !
We are getting close, and the latest info that I have is that the exhaust port outlet in our head mod is centered, and wants a 1.625" I.D. pipe. Now, I want to wait until I have that thing in my hand, and measure it before anyone goes out and buys a pipe for it. But it looks like the pipe with the 1.625" I.D., which I think is the D&D pipe, should be the one that will match up to our port the best.
I asked for a memory-refresher on these pipe I.D. sizes on my Ace UCE Project thread, because I can't remember exactly which pipe has which I.D. size.