Just as the title says, is there any difference in the exhaust port between the 4 and 6 port iron? Asking as I may pick up some irons soon to do some port testing.

 

iirc the front and rear irons are different as the 6port have more intake ports but the housings, middle iron and exhaust mani should be the same

 

Gotcha, but what I'm asking is if the exhaust port themselves are different between the 6 and 4 port irons. Not worried about the intake ports, and the exhaust side is where I wanna test some stuff. Looking at some google images the ports seem to be the same but just want to make sure.

 

Yes , the 4 port exhaust ports are smaller and they open later.

 

Thank you so much for answering.

 

Testing both will definitely give you solid insights!