i recently bought an 2004 mach 1 stock with an x pipe and a flowmaster catback. so I was wondering with what bolt ons i could buy to get at least 300-320 to the rear wheels. also could this be achieved without longtube headers ? or would headers be necessary for my kind of build ?. I would also like to add that I am not on a strict budget but would like to see what I could get out of this N/A. oh and another question, do you think its possible for a bolt on mach to run high to mid 12s with bolt ons and the stock 3.55 gears?