Re: Black stuff coming out of my exhaust
when you start up the exhaust is fairly cold. byproducts of combustion are co, co2 and h2o. the h2o condenses on the cold metal. this dissolves part of the carbon deposits in the exhaust system and exhaust gas blows it out onto the pavement. if you are getting below 18-20 mpg you are probably running rich producing lots of unburnt carbon particles in your exhaust. 83280zx trying to be amusing disregard except for the part about the fsm at xenon. pretty much nothing to worry about. most cars do it to some extent. if low mileage try a tune up. if still running rich might be the chts is bad.
86T, 350 Nismo 08 (#1415) gone but fondly remembered 81T, 83T, 83, 85T, 86T, 96TT