Thanks Sean  I would love to see the egt's for this.
This is only 3rd "598" I have done a whole port job on start to finish most are just updated from 4150 to 4500 plus open up ports.
Do you have any pictures you would share of divider area?
Have you done any back to back 420 vs 598?

This should be darn good 598 intake it surprised me that I could get 4.5" cross section in the plenum with out to much weld on out side of intake.( only one small hole)