All I do is lung hit and can satisfactory do this on al l14mm I have bought. The most restrictive is the hellfire viper but with lose lips it's possible and actually very nice. Next the luca creations speed, again similar to the viper but a touch more air. Next Id say no fear again and finally the most airy is Galactika Matrix which comes with two top caps, the one with two small slits either side is surprisingly airy. I have been a 2 joke either side on the stumpy and derringer which is considerably more air than the matrix and for this reason alone whilst getting a few Italian mods recently that only cater 14mm I thought I was going to hate it..... It's actually been the opposite with me finding lately im grabbing my 14mm over my 22mm. Funny how quickly what at first thoughts you think a restrictive air flow actually now feels very airy. The matrix for anyone who wants good air at 14mm is definitely the one to try, the slits btw can be tightened right down, this atty whilst they are all great for flavour I have found to be the best
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