WOW, Sent 461 stihl to let 309 work their magic, turn around was 1 week. I have worked it 2 solid days felling white oak in the midwest. I DON'T know what to say, thank you 309. I had no idea the stock version had so much left on the table. The torque, the chain speed, throttle response , AMAZING!!!! I LOVE IT! 309 MACHINE ROCKS!!!