Re: increase in 'smoke' from GT exhaust
Does it feel like it has less power?
If there is more black smoke, that is more unburnt/partially burnt fuel. So either the engine is getting too much fuel, or not enough air. Chances are its on the air side of things, its a known issue for the boost pipes to get a bit brittle with age and split, or for the lower one to rub against a stud on the gearbox and wear a hole in it. These pipes are under positive pressure, so a hole or split will cause air to rush out. This all happens after the MAF, which is what controlls fuelling, so in effect the engine is getting less air than it thinks it is and so cannot burn all the fuel. This is what I think is causing your black smoke.
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