DUK, I have the same setup except I have he DC-22 cam and had talked with John at DR Camshafts and SteveW @ 911chips and decided to set the redline at 7200. It was set at 6800 to start with and I was bouncing off the rev limiter in 1st & 2nd consistently. I have not been at the rev limiter since we changed it, in fact I haven't seen anything over 7000 with throttle being applied. I believe 7000 is very realistic as Steve says.
The other thing that I am learning is to shift sooner and being able to drive in a higher gear (lower rpm) due to having more power. Do a dyno run and see where your engine is making the most power. I will be doing this in the spring. Last run of the year that I did I ran higher gear through our favorite local run and was in 4th gear through what I used to run in 3rd. I am learning the highest RPM is not necessarily the fastest way to go
