The shift points on a manual are up to the driver - it's a manual transmission. The "canned tune" that uses the shifting point on the auto does nothing for the 6 speed. However, the rev limiter can be set higher or lower on a manual transmission Challenger. I believe this same "canned tune" moves the rev limiter from 6100 (stock) to 6300 RPM's on a 6 speed SRT8. Not sure about the 5.7L R/T.