are your motor mounts sagging at all? because i ran into my headers not fitting properly on my 5.0 because of that reason
+1 on that one. i installed a set of kooks longtubes on my friends 05 GTO and they are beautiful. he got them jet coated for some sort of a bargain, with highflow cats as well. they are awesome headers.When I put my 4V in Im going with Kooks, may be pricey but its worth it.