So AS have came up with the best solution they could and it has a few steps and gets a bit complex:
Take everything off the car
Put the standard air box back in
Stick all the stage 2 gear back in its box
Nip down to the post office
Wait for refund
Really disappointed as i liked the sound it gave the car, but all they could come up with was the sock. No well we will send you this bit out to try. So hopefully i can find another one that does work.