Re:
I use an eBay stainless steel header on my 4.0 and has held up fine for 2 years. I put it on there after chasing cracks in the original manifold with a welder for a while. I'm sure it is hit or miss with the Chinese headers, but I have been happy with mine.
My 37" MTR's (old style) are getting worn pretty bad, and since I ripped the sidewall out of one at Hawk Pride, I don't have a spare anymore.
Looking for a set of 37's in a 16 or 17 size. 8x6.5 bolt pattern. I have 15's now with 2" backspacing, and I think I would like to be a little narrower...