It along with the Magnum 1.60 Twin are far quiter than a Gasser, and also appear to be quiter than most other 4 strokes. I would not say the Magnum is any louder. You are comparing a OS 120 twin to a Magnum 160 twin. I am willing to bet the magnum is no louder than an OS 160 twin. I installed a Magnum 160 in a friends cub and built a split cowl. I did all the break in and first flights, and that engine is just awesome. No on board glow with a 2,000 idle. The engine was no louder than his OS pegasus 4 cyl. It runs as the same if not better than the OS. The neat thing is, you can buy it for $450.00 or less.
