As above, I have noticed that I can't hear it. Its a standard one

If it has failed what sort of issues/symptoms can I expect

I have just replaced a cone filter and put the standard airbox back on as I just changed the maf due to failure could these faults be linked?

 

With the standard airbox and filter, you won't hear the dump valve.

JohnD

 

 

In my Hawkeye STI, if I have the radio off I can just about hear it - but it's not like a loud atmospheric dump or anything along those lines.

 

cheers for the replies