1) New style heat-sink 2) Updated crossovers - not like these, but still very flexible 3) Upgraded power supply FETs 4) Part number change to SAX-125.2 (it really is ridiculously underrated so we adjusted the part # a bit) The 100.2 that are currently for sale have the new heat-sink design right? I have seen it advertised that they have them in stock w/ new heat-sink or is that a type-o?