Headers seem to be made good but install instructions Left out several little details about things that had to be Removed such as a/c compressor had to come off to Get motor mount bolts out so you could remove it and Left side air cleaner box had to come off to get in to upper bolts . But other than that the headers are very Good so far have had them on my truck a week or so They are prefroming very well .
Seems like the adapter pipe that connects to the stock exhaust is 1/4" bigger than it should be. You have to crank down the clamps ALL THE WAY until the lips touch or the pipes will rattle & leak.....an air impact is recommended, it is almost impossible to do with normal hand tools. Oh yeah, the stainless tip is 1/2" too big for the pipe size, crank the clamp bolt down all the way and it still wiggles side to side. Love the Flowmaster sound, but may end up getting it welded together.