all of the original ships have collision groups for their engines, so it is quite easy to make destructible engine (exhausts), although there are a couple of issues with ships that have other parts attached to the engines, e.g. the Valkyrie and the Hammerhead.

I think what he wanted to know was if it was possible to shoot and destroy the internal equipment item - engine/powerplant. it might be possible, but the equipment item would have to be mounted externally, you cant shoot anything exclusively inside the root of the sur without the ship blowing up first.