[jmh61]

I put the RarlyL8 headers and heat exchangers on my 86 with a Porsche sport muffler.

The Good
1 5/8" headers are the right size for the 3.2
The headers are very well made. Beautiful fabrication.
The are very light, much lighter than stock.
They are mid length headers, good at higher rpms, ie the track

Not So good.
Heat exchangers did not work well for me without the footwell blowers. I had originally planned to remove the footwell blowers but ended up leaving them in and jumping the relay to get them to work well.
Heat exchangers take a while to warm up, but once they warm up they can keep the cabin toasty with the footwell blowers.
Heat exchanger design and fabrication is not on the same level as the headers. Where the flexible hose hits the back of the heat exchanger, the hose rubs against the slip fit portion of the collector. It wore completely through the hose. I replaced the hose and wrapped the rubbing area with foil muffler tape. The tape has been on about a month, so far so good. I also taped all the seams on the heat exchangers with foil backed muffler tape. This really improved the heating ability of the assembly.
Initial installation was frustrating. The heat exchangers distort the geometry of the headers. When I got mine, the HEs were square but the three primary flanges were not aligned. The slip fit at the collector allowed them to move. No problem, I bolted them onto the heads, the flanges aligned and the HEs distorted a little bit. I bolted both sides on and then tried to put the muffler on. No joy, muffler didn't line up at all. Losened the nuts at the heads to get about a 1/4" play. Bolted the muffler to the headers snug tight. Tighted the nuts up at the heads and retightened the muffler. Joy. Hopefully this will help with your install.

I've had the headers on since last August. When I was trying to decide which exhaust to do I looked at the same systems you mentioned in your original post. Even with the points above, If I had to do it again I would buy the RarlyL8s. The SSIs are too small. The Fabspeeds are 1 3/4", too big. The BBs have muffler and install issues. The 993 HEs have "interesting" exhaust flow paths at the muffler inlet, require a custom muffler, flipped flanges and I couldn't find a good example of HE inlet hose routing.

I see you live in GA. I'm in Norcross, just north of ATL. If I can help you with anything send me a PM.