I just got back from the dyno shop. Here are the test results of my rebuilt 2.8L engine with K45 cams and 1.625" Knight headers versus 1.625" Bursch headers.
Gary was able to tune out the 3500 rpm to 4000 rpm torque dip we had with the Bursch headers by adding fuel to the VE table and 1-1.5 degrees of advance to the ignition timing table with the Knight headers.
With the Knight headers, we were also able to recover half of the max wheel torque we lost going from the 911S cams to the K45 cams.
All that and I ended up with a car that is MUCH MORE enjoyable to drive than when I was running with the 911S cams.
Now, if you are like me and having a hard time keeping all these dyno results straight in your head, see the following summary table:
Enjoy.