[Bimmer]

A quick read through any Spitfire pilot's biography will tell you that when the throttle was maxed out a large belch of black smoke would come out of the pipes in any but the newest engines. It didn't STAY on, as the engine would quickly recover the appropriate fuel/air mix. But it certainly happened.

Fair enough - I'm just trying to determine what is correct. As I'm sure you'll agree, a single puff of black smoke is certainly different from a continuous trail. If someone is going to pursue this mod, I would only hope that it was done with historical correctness in mind.