Wanted to go with a Flowmaster 40 SI/DO to exit out each side in front of rear tires but my gas tank is in the way. I looked at Gibson's Super Truck but they say it won't fit on my truck...but it will fit on other F250's w/o the long bed. If I run a Flowmaster 40 and exit both pipes on the same side would that sound good? Should I dump them down?