The Stinger part in the Stealth Kit is what made it special IMO and if you could get that stinger into Stock MMC filter or a G56 filter then you would really have something. The MMC filter is larger than the Stealth, unless you get the 1" Taller model, and now all those are not going to be available. Good thing they are cleanable!
I do not believe it makes any difference. I did a 10 mile test without any filter at all and did not notice any difference whatsoever? In fact, you do not need more air with the stock ECU, you need more fuel :-)
