Dynamometer Results & Comparisons - ls1 corvette c5 341ps/367nm

hi guys, what do you think this graph?
The tuner said he could not earn more
you think that my engine has problems?

thanks

Stock engine
conical air filter
1 3/4 headers
exhaust 4"
Aluminium flywheel

http://img687.imageshack.us/img687/8270/lafoto3sl.jpg (http://imageshack.us/photo/my-images/687/lafoto3sl.jpg/)