If you have read this thread you should already know the plane is inherently NOSE heavy, and that is with a Saito 100 up front (22 oz with muffler). The OS 1.08 with muffler is going to push 30 oz. You DO NOT want to put this much weight up front. Everyone has had a difficult time balancing this plane with the Saito up front. Moved the servos and battery as far to the rear as possible. With the OS 1.08 you will have to add a BUNCH of tail weight for balance. You will end much too heavy overall.

My suggestion, if you want a 2 stroke, find a lighter one, or consider another plane for your OS 1.08.