FWIW...Patrick at Pro Systems Carbs once told me that if the car went faster w/ an air filter on it, then the mixture isn't right.
Now IMO, an air filter can help if you have a hood scoop setup that is creating a lot of turbulence at the carb inlet. Doesn't mean the filter made it faster (like K&N claims), it just proved you need to rethink your hood scoop setup.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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