"Can you please explain a little bit about how the SB/SAB series differ from the more generic Hatori's?" Hatori mufflers are made for worldwide distribution in Japan. Obviously in different countries the nitro content and flying chracteristics are different. Most of the mufflers we distribute here in the USA ARE MANUFACTURERED FOR THIS MARKET and some are exclusive for US customers.( Todd Bennett Special, Jason Kraus Hyper and 3D Supers ) Some of our top flyers work in conjuntion with Mr Hattori to produce special designs. The " SB" designation is used for 2 piece " O " ring mufflers..." SAB " is used for " ONE " piece mufflers. " FH " is used to describe the NEW Floating Inlet utilizing no clamp Hatori mufflers purchased in the USA are guaranteed against defects in workmanship. Just see your dealer... The muffler must have been purchased from an authorized Hatoriusa dealer for the guarantee to be in effect and be returned in the original Hatoriusa box.. Current Hatori Hot Model Rundown SB-8SR O/S or Enya 32 ShuttleRaptor, Scadeau SB-8EX “ X-Cell, Ergo, Voyager SB-6RS O/S37 Raptor, Scadeau SB-6EX O/S 37 Ergo, Voyager SB-5RS O/S 46 Scadeau, Shuttle, Raptor SAB-5RS O/S50 Raptor, Scadeau "Hatori SB5-RS, the same model as a #544/50HNS-2 http://www.hatori-models.co.jp/htdocs/data_e/image/544.html You won't be disappointed, as it is quiet, forgiving, and powerful." SAB-5S “ Shuttle SB-50HP Hyper 50 Jason Kraus Special Any Hyper 50 60 Size ( 2 pc ) SB-1 O/S Enya 61 X-Cell 60 SB-9 II “ Front, Freya, Pro,Mellenium SB-9 “ Eagle SB-10 “ Fury 70-80 Size SB-70 O/S Engine 70 or YS80 All SB-15 2 pcs ...80YS All SB-15FH Floating Head Model 91 Engine SB-16 Todd Bennett Special O/S or YS 91 All SB-16FH Floating Head Model T.B. All SB-17FH Jason Kraus Special C-Spec 91 All Super Tuned Muffler Coming Soon GAS SB-12 Zenoah Spectra SB-12R “ Rear version