I understand that Burton changed the Canyon at some point making it
less stiff. Does anyone know what year they made this change? I'm
looking at buying a used 2003 and want to make sure it performs as
well as older Canyons.

I believe the base material may have also been changed, from a sintered base
to an extruded base... if I recall it went from being a "wide Custom" to a
"wide Bullet or Charger".

Sorry, don't remember what year, but it may have been 2003. Search through
old posts on Google, I know this has been discussed before.

Mike T