Get an omni condenser xl from Dynavap. <1. Figure out how it works, . This takes time. It did for me anyway. Oh man once I put the omni xl condenser( 80 $ ) with my 2016 double crown Blackwood stem.... I already had a few t i tips, ( both black and grey o ring models). Right now I've got this thing SO DIALED IN... so I built my omni V ap from scratch. ...... do this if you haven't had the omni experience and you've already got some legos, or not. Just saying now I officially KNOW the omni upgrade is amazing. You'll know once you get one and dial it in for your bad self... peace. Oh and also Cheers! D. Edited for clarity> . If you thinking you want an omni V ap and you think " oh man that shit seems expensive for whateveryou get,( omni xl condenser in my case) 80 bucks for a little screw tube thing? "Had to mate it with dv stuff I had. Blown away by the smooth richness. Of the hit. Alright cheers again, D.