So you were driving behind a semi truck in slow traffic the other day and noticed something peculiar at the top of its tall exhaust stacks: small metal flaps that flip open with each rev of the engine ...

One question I often am asked is, “How tall should the exhaust stack be?” It’s a seemingly simple question, but the only way to get an exact answer is to run an air dispersion model. That takes time, ...

Rheinmetall Group division, KSPG, says it has booked several major new exhaust flap orders with a lifetime volume of EUR200m (US$217m) from three unnamed European and Asian automakers. Developed by ...