Several folks have asked that I post pictures of my ST with the OS 120AX installed. As you can see the engine is mounted sideways and using the 90 degree pitts adapter. Though I don't like the engine sticking out the side the performance makes up for it, I previously had it mounted inverted with bisson pitts style but performance was effected by 600RPM. The Powerbox muffler fits the cowl and plane width perfectly and has no drag hanging out the bottom except the exhaust extension. I trimmed excess to supply better ventalation.

I appologize for the poor image quality they are taken from a mobile phone

Follow-up on my previous posts: throttle response and transition were GREATLY improved by using the stock Powerbox muffler, save yourself the money and forget about the after market Bisson especially on this plane since the thing is huge and won't fit inside the cowl without mods to the muffler.