hey, new here!i have a v6 3.8 mustang. green metal flake paint,gold stripes, gold covertble top.has 83,000 on it.no rust.i like her, bought it two months ago.i havn't done any mods yet, know were i should start?i want to start by making it a doule custom flowmaster exaust.also could someone tell me what the big x thing under my car that sticks down 2 inches is?ttyl tim