So you dynode an extra 20hp out of a filter? That sounds a little much, I'm not saying I don't believe it don't misunderstand that but every CAI company out there uses a larger surface area filter than the stock configuration and they make claims of 20plus HP and no one I have heard of has seen that kind of increase, usually its more like 5hp if you are lucky. Now LMI's true CAI saw like 10hp increase but that's the most I have seen. I dynode my 08 R/T after I installed a CAI kit and saw 0 HP and 0 TQ increase from baseline. Now on a stroker motor you may see a better return for the simple fact of the modifications to the engine, but stock I don't think 20hp is there. Question, what kind of car is that stroker in by chance?
When you are making 520+ horsepower, 20 more ponies isn't that much...less than 2.5%. The filter area is much greater in the tall filter, but I think it probably has more to do with the design of the air cleaner itself
...the little "unrestricted" air cleaner only has 1/2" of clearance between the filter and the housing, and it pulls hot air up off the engine. The big dual snorkel air cleaner has 3" of space between the filter and housing, and it is getting slightly cooler air coming in from the grille.
The engine is in my grandfathers parade float...the last new car he ever bought, a 1968 Chrysler Newport convertible. It is 19.5 feet long and weighs about as much as a new Charger, but it is saddled with old school tech, the worst of it being only three speeds in the transmission. It started out as a '73 400 block, but has been bored out to 4.385, the 4.25" stoker crank has the rod journals turned down to 2.20" and it uses 6.535" long Eagle rods, measured out to a shade over 512.5 cubic inches. Just the pistons/rings, crank/rods, and bearings cost over $2K. It has enough torque to light the tires up in all three gears, it is a hand full of old school mean n' nasty. I bought the pieces here: http://www.musclemotorsracing.com/
Sadly,my V6 Charger is a lot more fun to drive!!!