Exhaust manifold : Let the star bolts soak overnight...You'll be glad in the morning. Be careful if you have an 02 sensor in the rear area, it can give way a little but you don't want to overbend it. Get new gaskets for everything..don't reuse the 02 sensor gasket if you have it. have fun and have a 6pack ready for afterwards. <img src="/forums/images/graemlins/cheers.gif" alt="" />
personally, I bought a new stock manifold, so I have no experience with aftermarket parts.
Oh, and clean the surface area of the header really well before assembly.

Too close for missiles, I'm switching to guns...

'97 4Runner...SR5, 4cyl (3RZ), 5spd, 4wd, no rust, excellent shape.