I used ARH headers and they are really good quality. Plenty of room for rack & pinion or stock steering. They have so much ground clearance. They're not even close to sticking below the subframe, and they fit great with DSE mounts.
http://www.americanracingheaders.com...ebird_LS1.html
They're a little more expensive but if you call they
may be able to get you a deal