I have the Hedman headers on my 360 and they are inside the frame.A doddle to fit and remove, having just had to do it to change the flexplate.These then join into one behind the transfer case,and pass above the rear axle.It all sits above the skidplates.
........................... a grand espace back box as was a through type (2" in 2" out) by putting a 3" pipe through middle and re welding.. it works a treat and cost me around £68 in bits.....
i have one of those bastards, and ya a feckin madman, the fecker will break and cost u an overdraft !!!