Back in high school a friend had a '95 Ram w/ a 318/5.2 magnum. He put an open element K&N filter on it and I remember him saying it made a difference. Sure sounded good inside the truck too.
It outran my '89 Silverado w/ a TBI 350, lol.

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