If you look on LMR and other Mustang parts supplier websites, you might notice that all/most of the offroad h-pipes/x-pipes are out of stock or discontinued. Ebay still has some BBK offroad midpipes in stock, but those look limited as well.

I just ordered a BBK offroad x-pipe for my 82gt. I wasn't planning on going ahead and ordering it, because that's just another part in the way and I doubt I'll need it for a few months. But I'm afraid they'll all be gone by then.

So if you were thinking about ordering one, you might jump on it. I read online where the epa is cracking down on this sorta thing.