This thread should be in the Glow engine forum.

Saito engines do leak more oil near the cam gear. Saito engines do tend to weigh less and make the same or more power. The newer Saito engines tend to use more fuel to make their higher power. Saito engines will make higher rpm on higher nitro fuel.

The Saito 72 and the OS 70 are not in the same league. The OS 70 is more powerful but weighs as much as the Saito .91 and has almost as much usable power.

The new Saito .72 uses more fuel than a Saito .91 to fly the same plane (Funtana 40) and the .91 has much more power on lower nitro fuel.

The newest Saitos .72, .82, 1.00, 1.80 are more thurstly than the older designs and run best on higher nitro fuel.

All engines have their place.

"an extention on the muffler", the exhaust is too hot unless you get red high temp silicone tubing from JTEC. Even that may not work.