mac off road H pipe

It is cataloged as fitting either a 5-speed or an auto. No personal experience with an auto, but I can tell you that overall they fit a 5-speed just fine, so I'd imagine it would work on an auto just as well. Have you considered getting the prochamber instead though?
 
I thought about the pro-chamber, but texasmustang has the off road for $110.00 Verses $220.00 for the pro on our very own parts shopper.

Money talks, $110.00 can go somewhere else unless someone can justify that extra $110.00 for the pro.