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The most common causes of pumping out the smoke is dirty air filter,crook injectors, crook pump,advanced pump timing & turning up the fuel. Dose it blow any black smoke if off the accelerator as if coasting down hill? that would mean there is a leaky injector/injectors. Mine blows it to. (not as bad as before it was turbo-ed) But my pump timing & fuel has all been turned up to match the 18psi the turbo is making. It could as well be what your mate has informed you of. quite a few pump more fuel in to get them to go a little better if not turbo-ed as well. could be the injectors needing an over haul.
Have you checked the air filter? You'll be surprised at how much a dirty filter can make them blow more smoke & use more fuel.
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