As above the hose that comes off the i/c pipe and goes to dump valve???? has a bend with a rubber protector on it? Right mine is really soft and old,now will it colapse under boost??? or does air flow otherway through it??? Need to know as I get a hissing sound under boost so am thinking it is colapsing under boost??? this is my every day road car not the track car I am building....thanks

I think you're talking about the pipe that comes off the top of metal turbo pipe?, if so it expands not shrinks when under boost. Most likely you have a boost/vacuum leak on the small pipes around the DV or under the inlet manifold cover. The pipe that goes onto the pancake pipe is also prone to blowing off on remapped cars, but that's usually very loud if it's come adrift.

Edited 14 February, 201115 yr by pauldazzle

Nope, it will not collapse. It has positive pressure in it, so it will inflate when the turbo spools.

You sure the hissing noise is not just the turbo sound? The K03S is pretty loud for what it is.

Forgot to say, you can do a boost leak test using a tyre compressor or airline. remove the airbox and block off the air inlet. Pressurise the system through one of the small pipes leading to the inlet manifold and you should be able to hear where it's coming from.

Top info that lad