Feature Request: Misfires, Backfire support

[Cellgalvano]

Hi!

I'd like to be able to configure a different ignition timing while engine braking. As far as I understand the timing needs to be retardet in order to generate a backfire, but currently I there seems to be one single ignition map both for acceleration and braking. Would be cool to have these special sounds like pops, bangs, misfires.

Thanks!