Ramair replaced two filters for me no ploblem ,but if it hadn't been for the dyno bloke not being able to connect my bike to his laptop with TuneEcu it would have been a £200 bill for setting it up with a cracked Ramair filter,i dont think the Dyno bloke would have given me a free run if i had to going back with a non leaking filter on it,thats what really pissed me off.