@nugger @parusmajor @NitroDubs Variable exhaust pressure will be a new thing and can probably be used to tune some things combined with VVT and turbo. They're trying to do stuff with TEGs (Thermo Electric Generator) which is a voltage driver from temperature differential. It's not great, but it's voltage, so it could be used for tiny mild hybrid effect or over voltage for starting electric motor torque or something.