I love the headers but I'm kinda curious why he left the exhaust straps on there. Don't they just rattle around the hole time? I'd just replace those with some smaller hose clamps so they actually hold the midpipe in place.
looks like custom equal length headers.. there was a recent post by a guy building something similar now... interesting can. looks like a strange collector transition.
Looks like a custom job to me. Probably pulled the exhaust off of something from the 80s and welded it up. Love the headers, but I'd say you could replace the lower half with a hawk or something else of that sort..... unless you're happy with it of course, then stick with it.
The headers look like Force, but the megaphone is almost certainly from Megs/Cone Engineering. Sounds like a leftover parts hybrid bodge job. A loud one. [smirk]