Interested in an update on the headers now that you have a few miles on them. How is the finish holding up? Any issues with loose fasteners or flange leaks?
Also, can you confirm that you had clearance (realizing you trimmed the pass. UCA mount) to come off of the header with a 3" 45* bend?
I'm here in FTW and wouldn't mind seeing the setup first hand given the opportunity as I am getting ready to redo the exhaust on my LS3.
Plenty of room and this is with 3" tubing. It doesn't look like there will be much room until you get the pipe in there and then you see there will be plenty. You will need to trim a tad off of the upper mount though. I bet it would clear even without doing it but you should
to provide adequate clearance.
Headers are holding up like a champ, I did NOT install a header gasket. I used a light coat of the ultra high temp orange/copper colored permatex around the exhaust ports. I did use a copper flange gasket from sanderson (which is who makes the headers). No leaks at all so far even when really cold, as you know its been in the teens here this week. I attribute that partially to using good quality hardware. get the ARP headder stud kit and the headder bolt kit. Also get as thick of flange as you can for the exhaust tubing to bolt up to the header with.
You're not going to pull this off easy with a 2dr unless you ditch the tank though. I went fuel cell for a variety of reasons the clearance needed for this exhaust being one of them.
This is a breakdown of what I have in the exhaust and the part #'s. This was able to be 100% done in the floor of my garage. I will say that I ordered about 1.75 too many sticks of the 4' long straight stainless pipe.
ARP exhaust collector bolts P/N: 400-1215 $39.99
ARP headder stud kit P/N: 434-1301 $108.33
3" stainless x pipe (ebay special) $49.53
RPM EXTREME ceramic headers $595
Borla XR-1 mufflers x2 P/N: 40943 $301.98
Sanderson 3" gasket P/N: SHN-COPPER3 $35.00
Pypes 3/8" stainless flange x2, P/N: HVF13S $26.72
o2 bungs stainless M18 x 1.5 $12
o2 sensors x2 P/N: 12583804 $96.32
Verocious Motorsports 304 stainless $463.27
2x 3", 90 degree bends on 3" radius
2x 3", 45 degree bends on 3" radius
3x 3", 4' long tubing
4x 1/2" rubber exhaust hanger
4x 1/2" exhaust hanger rod
9x 3", 45 degree elbows
Took this video yesterday.