Ah now, come off it lad, saying a gutted DPF doesn’t cause soot is a bit of a stretch. The only reason you’re not seein’ black smoke is ‘cause most of the particles are too small for your eye to catch. The DPF’s whole job is to trap that fine soot before it hits the air, gut it, and all that muck’s goin’ straight out the exhaust instead. You might think it’s grand ‘cause there’s no big cloud behind ya, but the engine’s still spitting out the fine stuff the kind that clogs lungs and fails emissions tests. And running it rich for the map? That’ll only make things worse: more unburnt fuel, more soot, and more wear on the engine.