I only smoke Savinelli these days, I love them...quality for an affordable price. That said, after all of the Sav purchases I've made in my life, and all the research I've conducted for those purchases, I've come to figure out that their numbering method makes no sense whatsoever. If two pipes appear to be the same, and their specs are similar, my experience tells me they'll smoke almost identically anyway, so make your purchase based upon the price of the pipe, unless the bells and whistles are entertaining to you. Many times the only real difference will be the banding, stem material, stain, etc. If these are considerations, then purchase based upon what is visually appealing to you. To make a long store short, I've found that as long as the specs are close in the Savinelli line, regardless of the number, they'll smoke the same, so don't worry too much about it and buy (1) whatever is more affordable, and/or (2) whatever is 'nicer looking'.