Looking at the tech proposals - why don't we like foam air filters then? how many have actually caught fire? is there a particular make that catches fire? and why? is it to do with the 'stand off' (whatever causes that!) and what are we all going to use instead of - back to original perhaps at least we would all have the same..................... (hand grenade thrown) :-)
No need for hand grenades a petrol soaked piece of foam makes an excellent incendiary