no amal valve on mine.. i have wondered about the actuator which is the one that came new from TT -31.. the spring feels strong but i was told that the diaphram in a -34 is different?? and this might help it make more boost. its going to cost 80 quid for a new one to find out tho...
i know i should take it to a tuner but wanted to do all i can before it goes to save paying for jobs that i can do myself.. i was told to swap the exhaust cam for a std one from the bd10 .. i cant see how this would help though..