414 Dyno results: Missed combo?

RAMM said

This was also the first time I saw a K&N Xtreme assembly actually not hurt power--too bad they don't filter at all. It flowed really well on the flowbench as you would expect. The R2C filter flowed less @ 3" tall but a 3.5" tall filter matched the K&N and it will actually trap dirt and keep your cylinders clean. J.Rob

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I have a friend/customer who put one of these on his 440, watched Him make a few passes, laid down a cloud of gray/black..........never-ever did that before, have any A/F
#'s from the dyno before & after? I was thinking the increase in vertical airflow velocity might add too much pressure to the bleeds, but apparently not, curious................