Join Date: Dec 2008
Location: Marengo, Iowa
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Usually it means removing the "soup bowl", the half circle attachment on the bottom of the air cleaner lid. It essentially is there for noise containment. It does well for restriction, like the poor 2.5" exhaust they used on these trucks stock, just plain poor planning. Not really much to write about, simply cut off the piece of crap off the bottom of the lid, and you're done. On my 86 though, it had no soup bowl, only a half size opening in the bottom of the air cleaner. i cut that out, and had better flow there. A simple restriction right in the air cleaner base...what the heck were the engineers thinking?
The workhorse: 86 F250 6.9 4 speed 4wd 4.10 gears, electric fuel pump
The other workhorse: 92 F350 2wd crew cab, 92 6BT Cummins, NV4500 and GV overdrive unit, 4.10 rear axle