I've actually tried and tested all of them over the last two years
made hundreds of quarter mile passes at the track and many off track.
The Volant clearly is the best,
it's 100 % sealed from engine heat, none of the others are.
AND for racers' the Optional lower port can be utilized to RAM cold air from the front bumper.
The powercore filter is superior in design,oil free, never needs cleaning/recharging and is good for 100k miles.
Check out the CAI thread ...