066 flattop from Tenn is amazing. Very noticeable over my 660 mag. Been to hot here to cut much. May send my trusty 044 to Tenn in Oct. I love that saw just the way it is. I don't have a tach but it really seems to rev. BUT if Randy has a new recipe for 044's...... Haven't bought a saw in months. Might try & find a artic model with a heated handle