I have the pacesetter headers, high flow cat, and flowmaster muffler. I do like them all, but if you are worried about sound levels I'd go with something else as my car is very loud with this setup. but... I personally really like the sound, hehe, it's not loud at idle or up to 2500 but has a nice growl, but at wot it's LOUD and sounds like you're in nascar, hehe. That may just be due to the flowmaster but I am not sure as I've never heard any other supra with any exhaust really that I can be sure of.
I do like the pacesetter headers but a couple things I don't, but those can be fixed...
1. They aren't legal here in california.
*If I were anywhere else this wouldn't matter, since you are in Oregon it doesn't make a difference I don't think.
2. the O2 sensor needs to be moved down to the y and the wire needs to be extended and kept safe.
*easily relocated by a muffler shop, wireing someplace else probably, mine was done at a 76 station by a friend of my muffler guy
There is one REALLY good thing about the pacesetters though. The price of coated pacesetters is less than UNcoated thorleys.
Not sure on hp/torque numbers though, which is better with which and how the powerband looks either way. From what I hear the thorleys are a bit better but I have no clue and havn't seen any numbers to prove either way. I would think the pacesetters would be better for higher rpm's and the thorleys for torque on the low and mids as the thorleys use a shorter tri-y design and collect early. The pacesetters collect down to 2 pipes just over 2 feet down. then another 6-9inches or so till they collect to a single pipe.
also mine aren't coated but if I could go back and buy them coated or have them jet coated I would.
I've also wrapped my headers recently with thermo-tec wrap then painted over with high temp thermo-tec paint. Some have said not to do this as it can kill the headers with heat spots (also was a pain in the ass to do, took me and my uncle a couple hours to do and we had to use a prybar to pry the tubes aparts just a tiny bit to get the wrap around, ugh, hard), but since mine weren't coated and it was VERY hot in my engine bay I thought this was a good solution to keep the heat in the exhaust and if they break or anything I'll just buy some later and have them coated next time.
Now If I could go back I'd do a few things differently with the pacesetters
1. I'd buy them coated or have the top part coated somewhere but not the y, reason is next..
2. I would have had the y-pipe made custom at a good muffler shop and made to collect into a single 2.5in pipe down to the cat.
(I'm not positive as I should have checked but I think they are 2.25 or maybe even 2in??? anyone know what they end at the cat with?) (also heard people do this with the thorleys as they are a 2.25 or less at the cat, not sure how big)
Or just have gone with the thorleys. Just my take on things.