What weight dino did you switch to?
I've noticed K&N filters usually do show a slight drop in psi, because they filter to a smaller micron. They also clog faster, and require changing more frequently.
Still say use a PF24 or Wix.
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
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