I've got my car chipped by Unitronic last week and I have noticed that the turbo is only pushing 7-8 psi instead of 18. No cell so I don't really suspect the N75 to be faulty. I want to build a boost leak tester but I found 3 different ways to do it:

http://audizine.com/forum/showthread.php?t=104080

http://forums.audiworld.com/a4/msgs/1659806.phtml

http://a4mods.com/index.php?page=web...boostleak.html

Which one is the proper way? One is only connecting the tester on the TIP, another one is doing the same but is disconnecting the PCV and the other one is also disconnecting the tubing that connect on the intake manifold.

 

sounds like your back in your stock program, you would notice a leak that cuts your boost in half without a leak tester.

any of those methods can work, just start with one, i use the tennis ball method just because i had a tennis ball handy. hook it up, put some air in there and see where you hear it leaking. plug up the leak and repeat, until theres no more leaks. the air will still get past some of the PCV system btw, it will never be completely sealed. just make sure no intake pipe connections and vac lines leak, ignore the rest.