If you find a Ryobi 10532 (i.e. RedMax GZ400) for cheap, snag it. The strato GZ4000/400 with a muffler mod blows away my heavily ported Earthquake (which is a G3800 clone). It is the same chassis design. Give it a little timing advance and remove the base gasket if there is clearance and it's even better. You already know how to work on them.wish I never sold the ones I had now,,, can't find them for under 150 now