When i lift of the thottle after accelerating i am hearing a noise that sounds like a creaking door or air horn, this happened not long after i fitted a stainless steel mesh induction kit. I'm thinking that this might be a leaking pipe by the recirc valve or even the recirc valve itself, but this is just a wild stab in the dark. If this does turn out to be the recirc valve would fitting a dump valve help? Does anybody have any recommendations for BOV's, and why are they so expensive? I don't want to pay an arm and a leg for what is ultimatly nothing more than a pretty noise.

It is the recirc valve and it's not worth worrying about. BOVs will get rid of it but will just give you a different noise. There is debate about the benefit of BOVs which I won't start on.

 

It's really up to you - but you don't need to worry about it.

 

Dave