Hadnt seen/found this posted so I think its worth bringing up. Engine Masters on Motor trend did a few weeks backs an air filter setup comparison. The base engine is a 496 CI Chevy(gulp) making 750 hp without any filter. Listed below are their combos and the resulting hp those filters will support. + means gained hp, - means losted hp from peak hp of the base engine. 19: 6.25 x 2.5 mini filter= -145.1 for a max of <300 18: Single Snorkle mopar big block = -95.8 for a max of 300 17: Foam filter Velocity stack = - 72.4 for a max of 350 16: Fly's eye(the triangular eddlebrock set up that is somewhat popular) = -71.1 max of 350 15: Dual Snorkle Mopar= -53.1 hp max of 390 14: 10x1.25 short air filter, paper element = -33.5 max of 350 13: 1.5 inch drop base, K&N 14x3 inch filter with K&N filter lid= -18.8 hp max of 650 12: 14x3 k&N filter, 1.5 drop base, flat solid lid= -12.7 for a max of 660 hp 11: Dual Snorkle Mopar with the lid flipped upside down= -11.9 hp max of 640 10: 14x3 flat base and lid with fram filter= -10.1 for a max of 640 9: B&B lid with K&N filter= -8.9 for a max of 660 8: 14x3 with K&N filter lid, flat base= - 7.2 for a max of 660 7: 14x3 flat base with solid lid, K&N element= -6.6 hp and max of 675 6: K&N filter lid with 14x3 flat base, element tapped up= -3.5 for 675 max 5: 4 inch tall, 10 in, flat base, solid lid= -1.2 hp and 750+ 4: Open carb, base line: 0.0 3: K&N velocity stack with filter lid= 0.9 for a max of 750+ 2: Homemade "Salad bowl" with K&N filter lid= +3.0 hp and max of 750+ 1: Open, no element, Velocity Stack= +5.7 hp and max of 750+ Just some food for thought.