As Dan said, you need more info.
Can you get it scanned with VCDS? If so, paste the results here and it's easier to help you out!
A split DV won't cause the boost "to go all wrong". It will only give less pull in the simplest of terms.
hi guys, thanks for the replys and sorry for the lack of information.
unfortunally i dont have access to VAG-COM
the boost feels like its coming in very late and most of the time is way less than what it should be 2 days ago for example. and it wents out more than it used to, see explanation below
the thing is i installed RAMAIR intake, but didnt have the correct noisepipe to connect to the k04 bung, so basicly now the pipe that used to connect to the intake (with the dv?) is just hanging there open and it wents out, like a bov.
iam in the works getting the right pipe to connect to the bung like this.
http://www.mk5golfgti.co.uk/forum/index.php/topic,95592.240.html(iam also buying LOBA hpfp, sparkplugs and DV+ next month)
so considering i found no cracks or splits on the pipework on visually inspecting (thinking about getting a mechanic to measure and check for leaks in the boost system) i thought the DV might be at fault since the boost isint what it used to be, coming in late (the car revs but nuthing much happens) then it comes in later.
but iam looking for other parts that might be at fault for me to check