good point our06t , you can check actuator by regulating air pressure to 10 psi , connect a suitable blower attachment from air compressor or similar and see if you have actuator movement! personally I would fit a stronger actuator as mine on 10 psi tune would only hit 7psi for 1 or 2 seconds and drop to 5psi until I put a 12 psi actuator $120 supplied only Adelaide Turbo service , took me about 1.5 hours to fit .... R+R.. heat shrouds , dump pipe, remove actuator hose, 13mm 1/4 drive with 2 long extensions to remove actuator from bracket, small straight blade screw driver to remove circlip from flapper ...carefull its a small circlip that can drop into engine mount recess ! a mirror was also used to relocate circlip and larger straight blade screwdriver to push it on completely , I must admit this was tedius and was done on a hoist. hope this helps