I'm not sure coating will help with weak welds but may help with hot spots in the metal that could crack. It's a gamble. You'll need exhaust manifold gaskets but shouldn't need head gaskets that you asked about earlier, new exhaust bolts wouldn't hurt, be sure to use anti-seize .

Those heperformance headers look like they would get in the way of your A/C evap box. Does anyone know if the OBX headers allow you to keep the factory air?

__________________
Rick Large
Mesa AZ
'99 Ex-Ranger 2wd XLT 5.0, Explorer V8 and auto transmission swap, floor shifter from Nissan Altima Parts, aluminum radiator & electric fan, OBX headers, 3" custom exhaust, explorer roof rack, 2006 mirrors, cut front 60/40 seat to buckets, 4 in lift spindles up front and shackles in back