Michael L wrote on 02/04/14 at 07:40:13:I currently have this muffler mounted, which seems to work quite well, but I ain't sure.. It hasturned blue/yellow right at the middle, so im guessing it's a little too restrictive..? Can I in any way do damage to the engine by this..???
If it were the header I might say you need to go a little richer, but this is the muf and most likely you have a baffle there. Causing a little extra heat to be transferred to the outer wall.
Also note that all waxes and oils should be removed from the surface of the header and muf or they will cause it to turn blue.