I am doing a 4.0 Head conversion and need to install a new manifold/header. They sure can be expensive. Here is a link to an OE replacement manifold. Has anyone used this? Its very similar to Borla, Thorley, Banks, etc. Was there performance gain? What headers have you had good luck with?
Link- http://www.autopn.com/store/pc/viewprd.asp?idProduct=20009

78 CJ7, 83 wide track axles/Dana 30 Front W/ OX Locker, Model 20 rear w/ one piece shafts(welded tubes)/Detroit Locker, 4.10 gears. 4.5" spring lift with 3/4" shackle lift. 35x12.50 BFG MT, 4.2L, Weber Carb, K&N, T18,Scout Dana 300,Warn 9.5ti