Here is another dynapack run with a bone stock Boxster S for comparison.
http://i4.photobucket.com/albums/y144/bisimoto/DeSnorked986S.jpg
Do you see what I mean about your cars hole at 4300 rpm(down to 140 ft lbs)? Peak performance is much lower on your run also. I am not here to burn you down. I just figure if you want to get a good baseline run before tuning your car it should look similar to other stock Box S runs to be valid. Looking at your numbers I suspect a fouled/contaminated MAF.