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I've gone well past 70mph in 3rd... (she ain't giving much more up there,.. just beggin' for the next gear, but no damage)... the engine will just peter out before there's any damage...
You'll get faster acceleration, if you shift out to 4th at about 65 or 70... at least with my bike...
PS.. by "drag pipe" do you mean no muffler at all?...
No guarantees with that set-up...
Redline in 3rd, is 78mph... on your stock speedo...
(
PS... redline.. is max revs, not max HP... you don't want to hit redline every shift, or maybe ever at all...
Max acceleration will come from shifting at a point that puts max HP in the middle of each gear... That's hard to judge... and will vary
HP peak is somewhere around 5.5k rpm.. )...