<VV> unique corvair exhaust

[Charles Birchwood]

So, I've heard about these special exhaust logs for corvairs that were made back in the day. They've been described as bigger round, smoothed out on the inside, and still fit within the stock shroud set-up of the car. The brand logo was described as a footprint. Can anyone shed some light on this?
 Charles Birchwood Ps. 121
"Nullius addictus judicare in verba magistri"-Horace