I like my Saito 180 alot.... it is new I guess I have about 2 1/2 gallons through it. I can feel it getting stronger and using less fuel. I am turning a MA Scimitar 17x8 at 9K..Wildact 20% heli mix. The Saito 180 does sound great doesn't it? I love the OS 160 too.... I like not having to cut the cowl so much for the Saito.