Yeah, Sam's tune are very conservative to keep you in the safe range. I was at 400whp with Sam's tune and was working on a custom tune last year when my clutch was slipping so we were losing power above 6k but was confident we were going to see more than 400 if I got the clutch fixed and then finish the tune.
A custom tune will allow you to unlock a little more HP as Chuck mentioned but it is the other parameters that you see the real benefit. Better cooling from fan speed adjusted, better throttle map, etc.
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