I assume that it is normal with my exhaust, that if I get on it and go through the gears(1-3), when I look back I see some dark smoke. Is there a way to turn that into more power? I haven't touched the ignition, I changed the factory plugs at 107000 miles, that's it. Everytime I change stuff even the brakes, I think who ever had this car before me didn't maintain it, the stuff is still factory. I finally got my tires to chirp third, went around the block after changing oil. I guess a shifter will make that a little easier. Just curious.