i want to put exhaust on my truck but ran into a few snags. i want it loud and and little more hp. i plan on running headers...any help to which kind?? also want to run no or hollowed out cats. is it worth it or should i get hi-flow cats?? is there a power/sound difference?? also an X-pipe with dual mufflers. either IMCO 1 chambers or flowmaster super 40 series. cant decide. magnaflow sounds to whimpy IMO. i want it LOUD! any comment/suggestions would help me out alot. thanks