Quote:
Originally Posted by 911TT33
Ok, thanks for the tips guys. At least now I have some direction 
So, I'm assuming you recommend sticking with headers that have 1 5/8" primaries to suit the Carrera heads ? |
41mm exhaust port I.D. = 1.61" I.D.
Add tubing wall thickness, ex: 16ga to get O.D. = 2x 0.065" + 1.61" = 1.75" O.D.
So to port match to your heads and not add a flow restriction you would ideally use 1.75" primary headers.
Will 1-5/8" headers work? Yes...