One thing I noticed that may be of use to turbo users that still have the evap canister connected is that the evap valve will open under boost pressure from the throttle body side.
The spring is very light inside the valve/solonoid so under boost the valve opens pressurising (the fuel tank (original fuel cap only lets air in not out).
If you must keep the system installed for any reason but do not want to run the risk of pressurising the fuel tank you can modify the valve on top of the canister.
On the rear of the valve is a small plastic cover with a triangular shape in the end, remove this and you will find a hex/Allen key.
Simply tighten this as far as it will go to permanently closed the valve, glue the plastic cover back on and fit a vented fuel filler cap.
Externally the evap system will appear to be intact but will never actually function.
May as well contribute back to my very old thread (haven't been here for more than a year I guess...).
You can keep the canister functioning in vacuum conditions and still protect everything from boost, just mount a one way valve on the fuel/vapor line from the canister to the throttle body. Exactly what I did on my former setup, worked flawlessly for several years.