[Greenblurr93]

1. it makes the exhaust flow easier, there for you engine works less to "push" the gasses out. and headers can range anywhere from $50 for a crappy one to $600 for a race one. try not to scimp too much because the lower quality ones have a habbit of cracking..

2. is it possible that the previous owner swaped in a sending unit with that light capability? and then when you had it fixed they put the stocker in which didnt come with that light? in my opinion... those lights are usless anyway, i go by my tripometer because i know about how many miles i get per tank