Bloody thing gets too much resonance in the exhaust with high rpm and starts undoing the air filter stud or nut so I keep having to tighten it up (f'n tight mind you), forgot to do it for about 2 weeks and it came out yesterday, did a u turn to look for it but it was gone so now running no filter, last time it fell off the filter, cover and stud/nut stayed in the engine bay for 15k's, ha.