I'm in the process of figuring out what pipe I'm going to use on my 86' 250.  I've heard people on here say the ftz pipe has nothing on a q pipe and I've heard they haul azz.  I think Iceracer has run or is running an ftz, but his is a powervalve type.  When I called ftz a guy in the shop answered the phone and didn't really give me the opportunity to tell him what it's for...he just told me to email him.  I honestly will be very glad when I figure this out.