That is just carbon. Most new cars will do that if you floor it. Like you said, more cars do run rich. It if a safety feature that Nissan programs into the cars computer. If a car runs lean it can damage the engine very quickly. That is another reason our cars can benefit a lot from tuning. By leaning the air/fuel mixture a little bit, they are able to extract more power.
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Changes come. Keep your dignity. Take the high road.
Take it like a man. Momma Sed Like the rain. Like a kidney stone.
Its just a broken heart, son. This pain will pass away.
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