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Posted this on May 24th regarding Steeda UDP:

Stock crank pulley 7" plus belt width
Steeda 5 1/4" plus belt width (approx.) WP turns per rev. 1.4

Stock Water pump pulley 5"
Steeda 6 1/4" (approx) WP turns per rev. 1.2

Other accessories turn at approx. 75% of stock speed per revolution.

I would suppose a higher redline is mostly dependent upon the valve train in this case. I do not think they would change any of these components and assume they simply changed the rev limiter in the tune. There should easily be 4% more in the standard components.
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