As a kid in the late 50-ies, this Taifun was one of THE engines to buy along with Webras. Remember, that was the Control Line area, and everything that just looked pretty would have a high "wish to posess" value, though practical value of that exhaust was low. Probably due to piston sub-induction which caused spent gasses to re-enter the crankcase.
Glow engines was something that the Americans tampered with at the time, and eventually it caught on in Europe as well, even though these engines did not nearly lasted that well and were not able to pull a decent prop without loads of nitro.