Will most speed shops like Livernois Motorsports install cat-less H or X pipes or would I have to do this on my own? I installed an H pipe on my old '86 Mustang since no regular exhaust shop would do it, but I was thinking about calling Livernois to see if they're willing to do this type of work. I'm guessing they do but I would have to sign some kind of disclaimer stating that the car is for track only or something like that.

Any exhaust shop will do it provided you bring it too them. Atleast, thats been my experience.

In my experience (at least in Michigan), most places like Muffler Man or Midas won't do it since the off road H & X pipes are technically illegal.

*shrug* Muffler Man did it for me. They didn't sell you the exhaust, thats the illegal thing.

Well...this was about 10 years ago so maybe things have changed. I'll have to stop by the Muffler Man in Monroe and see if they can do it. BTW, I like your '86. I wish mine looked that nice when I had it.