You've gotten some great advice here. As mentioned don't try to launch out on street tires, drive it out. With street tires I get the best 60' with a SLIGHT bog while slipping the clutch.
With that MPH, 1/8 and 1/4 , it looks to me like you are shifting too early. If I shift at 5K MPH is like 95-96, if raised to 5.5K it goes to 97-98. This is with the stock tach.
Don't take this the wrong way but IMHO you could easily go a tenth (or more) faster by modifying your driving style. It's also cheaper than buying a another part.
Good Luck!
PS: GEARS!
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