Does anyone have any information on making a pressure tester for checking out airleaks. I found found a split pipe a while ago and also fitted a simota induction kit. Prior to this I was having a slight surging issue under low revs/high load situations. Changing the pipe and fitting the induction kit nearly totally ellimninated this until a couple of days ago. Suddenly my car has started surging even more, instead of surging at 15 odd PSI its surging as low down as 10 PSI. Before anyone says it, I have already changed the MAF and fitted a N75J, so I know they are not the cause. I have also checked out the DV and made sure it is functioning correctly. Hence the orinal question of making some sort of pressure tester just incase there is a leak somewhere........any help would be greatly appreciated due to the fact xmas is coming close....the kids think I have a money tree in the back garden .....and I cannot bear to through cash down the drain by even contemplating the fact that the Audi stealer is going to attempt to check this out whilst his hand is firmly planted in my pocket!