This test and tune is with a 2006 Z06 that had a radical CAM installed and then tuned.

Then owner pays big bucks for

1. POS Vararam CAI
2. Ported throttlebody
3. Ported intake manifold
4. different valves
5. Valve springs.
6. Dyno tuned.

Car ran like crap with the above. Owner had us retune it.
Engine had big problems on decel coming to a stop as engine dying and would not want to start without multi tries.

Start problems were fixed and most of the decel issues but still has some RPM loss when coming down to a stop

Worse is if you compare the performance numbers there is almost no gains seen with couple thousand dollars owner paid for the parts and what the shop RPM in LA Ca area) he went to charged.