What LS Headers for 4x4 square body?

[NorCalAnthony]

Thanks for taking the time to play around with some of the options out there. I've been looking stuff up for my own swap for a while now and found a couple options that a lot of seem to work real well besides just rolling the dice on a set of f-body headers and modifying them or the truck until they work.

One is the Doug Thorley model THY-323Y-C which are a little pricey but they have 3/8" flanges with 1-7/8" 14 gauge primaries and come ceramic coated inside and out. They also use DT's Tri-Y design that's supposed to be one of the better designs out there for making power if you believe that sort of thing. I haven't seen as many people using these (not sure if they're newer?) but the handful I've seen have been real happy with the fitment and quality.
http://shop.dougthorleyheaders.com/p...ers-thy-323y-c

The cheaper and far more popular option is the Schoenfeld model 1302LS1 that have 5/16" flanges with 1-3/4" 16 gauge primaries and come painted black. They also come ceramic coated for close to the same price as the DT's but they don't have any flanges on them so you're stuck using the slip-fit connectors or grinding off the ceramic coating to weld it them up to the rest of your exhaust. They also apparently come with 1-7/8" primaries now too but I haven't seen anyone running them yet to see if that affects the fitment at all. One more note on these, they used to have the O2 bungs pointed right at the shackle on one side so a lot of guys were having to cut and rotate the collector but they recently changed their design so the O2 bungs face upwards and out of the way (according to a coupld of guys using them on CK5).
http://www.schoenfeldheaders.com/truck2.html