This is our new "symetrical" log header. They are 11 gauge stainless steel tube (ss) with 1/2" mild steel (ms) flanges. They flow better than the CastFlow and will make more HP.
Customers have reported picking up 2 1/2 tenths by just bolting these on!!
2007.5 - 2010 trucks require a coolant line relocation fitting.
You can also order these with or without a riser for the EGR. They are custom made to order so expect 1-2 weeks build time.