http://www.jegs.com/i/Hedman/500/68440/10002/-1

Anyone use these or know anything about em?

It says
"Modification to stock exhaust required to retain catalytic converter."
"Must modify rotary A/C bracket"

It would be going in an 86, how much modification is really needed? I plan on getting custom exhaust when i get the headers installed anyway.

 

You will have to do some cutting and fitting and welding to make it all come together. Or you can delete the cats and you might still have a bit of bother fitting it, but it will be easier. Hedman is no different than many other manufacturers: you just have to decide how much hassle and work you are willing to take on.