Without a doubt Stihl has created one hell of a saw I call the”Boss Saw” To start off this saw is no longer available in U.S. The particular saw was ordered straight from Germany made sticky by Sthil. They make the 661 now but it doesn’t have all the power the 660 has stock. We ported the 660 changed the piston and advanced the timing put a new gutted dual port muffler on it and created a beast the 660 “Boss” by Sthil. Without a doubt if you have never felt raw power then this saw would rock you off you feet “wow” what a monster.The only problem I could see with the “Boss” 660 was the weight it weighed in at around at 22 lbs. let me tell you if you cut or bucked with this saw you fealt it at the end of the day. The saw would sling chips like the beast it was. I put my Husky 288XP up against it but there was a little disadvantage because of the piston displacement but still will stick with my 288XP because of the power to weigh ratio. But I will never ever say I didn’t cut with the “Boss” 660 just raw power straight from Germany. By now my back is hurting just thinking about it.Have a nice day. Stumper
