there's more info here:
http://986forum.com/forums/boxster-racing-forum/31987-how-remove-charcoal-canister-not-get-cel-2.html
including part #:
996 113 140 53
996 113 340 50
996 113 233 50
996 113 213 51
good luck without pulling-off the intake (at a minimum will need to pull the two crossover tubes methinks).