[Formulajones]

From what I've seen CNC Dports from Kauffman to go about 325 cfm are about $3200. CNC eddy round ports from Butler at the same 325 cfm are $3700.

So yeah there is a price difference but that's not where the extra costs stop. There are exhaust differences to consider and when people already have a dport car with d port manifolds they are reluctant to spend the extra money for the change. Now you're looking at RA manifolds or headers that have to be swapped and that doesn't always line up with your existing exhaust system either so there are some cost modifications there to consider.