Elko and I understand "velocity". That where you're gonna kill the use of the engine when you really wanna improve the flow characteristics. Without bragging, I can make you motor turn up to and over 9 grand. Let's not forget the basics though. DO you really wanna turn 9 grand? Elko's got a better perspective on where he was going with his reply. You can do very very well at limiting this engine to a more respective rpm like 5500-6000 and when it's just right, you'll swear it's turning 9,000.