So this is my now month old Blue Dot Glass piece I picked up from my local head shop. I really love this piece, it's thick, has a 10-armed tree perc, ice catcher, low drag and a dope custom bowl. Now the downstem it came with looks a lot like the top one http://www.bbsmokeshop.com/files/2009/08/glassonglass19-19mm-glass-on-glass-diffused-downstem.jpg The other day I broke my buddies bong but he let me salvage the parts and I walked out with a downstem that looks a lot more like this with 3 slits on each side http://www.marijuana.pl/images/economy_diffusor.jpg So my buddies and I are burnin with my bong and I say why not try this other down stem I have and see if there's a difference. Turns out there is HUGE difference. I fucking love this new downstem, it has really changed the entire way my bong feels. Had no idea a simple down stem piece could affect the quality so much. Just wondering if there is a specific reason why the second piece feels so superior?