The slant six with a 390 Holley 4-bbl.

14"x2" open element filter/housing (WIX)
Max Torque : 155.596lb-ft
Max Horsepower: 113.730hp
Avg Torque : 150.006lb-ft
Avg Horsepower: 103.531hp


14"x3" open element filter/housing (WIX)
Max Torque : 156.068lb-ft
Max Horsepower: 113.584hp
Avg Torque : 150.271lb-ft
Avg Horsepower: 103.686hp


14"x3" open element filter/housing (K&N)
Max Torque : 154.269lb-ft
Max Horsepower: 112.463hp
Avg Torque : 148.416lb-ft
Avg Horsepower: 102.434hp


14" baseplate only
Max Torque : 158.393lb-ft
Max Horsepower: 115.839hp
Avg Torque : 152.777lb-ft
Avg Horsepower: 105.826hp


A run from the above test: https://www.youtube.com/watch?v=IlkXawoGFLo

Chris


2011 & 2012 Beaver Springs Dragway Outlaw Street Champion 2012 BSD Friday Street Racer Driver of the Year 3-time Jr. Stock Eliminator 2-time Mean Street Eliminator '69 340 Dart 1.500 60ft, 11.359et, 117.08mph