Compare the Tower Hobbies .46 BB to the others and don't forget the 'bang for the buck' aspect. A BB .46 will perform better in the WM T-34 than a bushing engine and the Tower engine is lower priced than the OS with quite good performance and life. I've run WM T-34s with both a Tower .46, a Saito .56 4-stroke and an OS .46 LA. W-A-Y diferent with more power.

quint