He is talking about a stock ported engine.He just ported out the throttle body. Do some intake port work and it will get better.

This goes for any car,thew first best mod you can do,I would have to say is exhast,or intake.. Changing the exhast to a more free flow set up will help the engine breath alot more.

I dont think the powerband for the 6 ports are still strong up in the 11k rpm.
I want to see some dyno charts.Not sure on the 6 ports but 12A stock ports the power band dies out about 9ish and no need for any more.