More filtration surface area = better...
I've seen a lot of people who agree that a filter isn't that important until you start producing more power...
E.g. RB30DE from a VL commode uses the same filter as a 5.7L V8 VS commode... One produces 110kW and the other around 165kW (or something around there...)
'86 AE85.5 Levin
I don't claim to know everything... That doesn't mean it isn't true....
i mean the size of the neck sorry.... get a big one but ideally the neck should be smaller than 3 inches so you dont have to reduce the size down to the throttle body