Have you tried
www.probetalk.com ? The bad thing is that you might not get the greatest response there either, but it's worth a shot. In addition, probetalk.com tends to be more technical than MX6.com.
Too bad you didn't ask about 2nd gens, I could have helped you out.
Here's the 1st gen performance forum:
http://www.probetalk.com/forums/foru...?s=&forumid=99