Exhaust Pipe Diameter?

[karmarepair]

...for the stock Sonex two into one. I'm not at the hangar, and don't have the plans handy, and want to order some bits to make a "test pipe" with an A/F ratio sensor bung hole, for tuning my AeroCarb. Pop the existing extension out, put the "test tube" in, tune, return the extension, fly. RInse/Repeat if necessary.

[Area 51%]

1.375in O.D.

[Bryan Cotton]

I was going to say 1.5 but I couldn't get a great measurement with the cowl on and the pipes wrapped.

[karmarepair]

1.375in O.D.

That is what I thought, and I'm going to go with it. If I'm wrong, I can "embiggen" the end in various ways.

I'll report back when I have Facts On The Ground.

[Bryan Cotton]

When selecting VW answers I always go with Area 51%.

[karmarepair]

Measured today: OD 1.387, ID 1.290, the expanded portion of the extension 1.509" OD.