slight thread drift.....air & oil filter data
...just read a thread on the toyota tundra forum; a guy tried K&N, Amsoil foam, stock OEM and off-road paper filters, and found that some of the high-flow was at the expense of trapping dirt.....there was much more 'metal' in his oil filter, implying, scientifically or otherwise, that abrasives were wearing the insides of the engine at a greater rate.
........always something else to consider eh?