I've not heard of K&N doing cusom filters, but I would have thought there was some way you could get filter material from them to make one up easily ... not that it matters now
On the really serious detonation damage that I have seen, about half the piston looked as though something had been gnawing away at it, but more interestingly, the whole head and valves looked as though they had been sprayed lightly with aluminium.
Sandy ,thats where the piston starts to melt and the ally particles fuse to other parts
Dave , I think you've answered your question - no filter on the strip
1965 Belvedere 2 426 Wedge.
Climate change,global warming,the biggest tax raising scam ever devised by man for mankind.