Those "foam" filters are not only dangerous, but really like performance.
https://www.motortrendondemand.com/d...ut/0_f6zyfspf/
That velocity stack with the foam was second worst of the 19 air cleaners they tested, killed 72.4Hp and they felt it was a restriction with much more then a 300Hp engine. They didn't test that style of Fly eye, but I could see it hurting some major Hp too.
Seems getting the air UP away from carb and then a straight direct shot down the venturis is the best for Hp. That last one above is just an abomination. But if you need filtration and have limited hood clearance?????
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