Hi Guys, I know this has been repeated in alot of places but I just want some hand holding before I connect a compressor to my engine I have the old hesitation issue where as the car is coming onto boost (boost gauge reads 0) the car hesitates, get over that hump and all is good. I have read that vacuum leaks can cause this so wanted to check for leaks. I have done the soapy water test with nothing so I was going to follow http://www.gtr.co.uk/forum/174597-gtr-boost-leak-tester-diy.html and http://www.skylinesaustralia.com/forums/topic/250275-boost-leak/?p=4337070#entry4337070 but am not clear on which hose to pressurise. My plan was to take of the Apexi air filters and sensors, block these both off with PVC piping and caps. Once the intake to both turbos is sealed I would remove the bottom hose (the hose on the right of the pic) off the PCM (photo attached) and slowly pressurise the system. I cant figure out why to remove all the hoses as the link on GTRUK did. My other option was to block one intake (say to the front turbo) and pressurise the other with a boost leaker tester? This may be easier Please let me know if this is daft, sorry if the answer is here but I have searched the forum and couldnt see a clear answer as to which pipe to pressurise. Alternatively if you are in the Newcastle area i would be happy to part with a case of beer Thanks, Dean