Sepration Idea

duramax's sound like they have more rpm due to more cylinders firing per revolution. It's not as high as you think.

How would you police your idea for rpm limits?
 
I was thinking a recall tach. Which i'm sure you'd have people rigging them up so they only read out 4500 or so, but i think it would be easy enough to determine if a guys is running 500-1000 rpm over the limit.
 
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There will always be cheaters. Well, except for the run what you brung class, anything goes...
 
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