I would like to use my bailey dump valve on the b18ft and so fitted it the other day but i cant seem to get it to phhhssst...i had it fitted when i had the standard t2 fitted and it sounded awesome but now im running the t28 all im getting is wastegate chatter, im running the same boost as i were with the t2, i cant understand it, All the vacuum pipes are fine and in the correct places, could it be an actuator issue as i have no clue, any help would be appreciated, Tim