Hello skyhawkmatthew!
M2dude gave a good answer on your question in post #1085, so I think I may quote this here again.
Originally Posted by M2dude
As far as the MAX SPEED bit goes, Concorde was as we know flown to a maximum of Mach 2.23 on A/C 101, but with the production intake and 'final' AICU N1 limiter law, the maximum achievable Mach number in level flight is about Mach 2.13. (Also theoretically, somewhere between Mach 2.2 and 2.3, the front few intake shocks would be 'pushed' back beyond the lower lip, the resulting flow distortion causing multiple severe and surges).
The maximum altitude EVER achieved in testing was I believe by aircraft 102 which achieved 68,000'.