I dont understand why soo much wondering about exsaust...
Once I drived my litle Fiat 126 to repair, without exaust and with last seat bank cuted out, so workman can repair it without bringing engine out of car. (engine is back).
Whan I started it, imagine the noise inside car

, it wos nice

,
but whan I started to ride and give more power-15-30 cm flames came out from engine, I wos afraid to fire up car
So why wondering to se flames? Engine is explosion device, will you see it depends on 100 other things, I believe Oleg & Team will make it good as possible!
Also, we need some new kids who will buy this sim and play it as a game, some extra flame highlights are for sure welcome...