[429mustang]

I used the Dr. Gas x-pipe that starts out 3" and goes down to 2 1/2" halfway through the x-junction, it's a pretty sweet setup (it was kind of a pain though cause I was using BBK longtubes which have 2 1/2 cone collectors, so I cut them off and ordered 3" from Dr. Gas and wedled them up). I'm assuming the Hookers have a 3bolt flange, you could either cut the Dr. gas front flanges off and replace them (or they could probably do it when you order it for pretty cheap) or cut the hookers off and install cone flanges. I probably wouldn't use 3" all the way just cause you'll lose some torque and probably won't make up for it in topend power, but I figured the 3 down to 2 1/2 should smooth the exhaust out some.