when porting oe headers do you just port the flange that joins to the heads,. cheers

 

Harvey is the man to speak to

Tony

 

true but he sells them so i dont think he will want to reveal his tricks, if i port the flange that joins to the heads then match the link pipe and up pipe (turbo already done) this is as much as can be done isn it,,.,,,,

 

Thats all I'd do. Port the flange ends out to the sut marks. Did them on my Wrx a couple of years ago and there was a definate improvement in midrange power.

 

I have been told, you, do all joints so take it apart, and port as much as poss as this will help flow, as it'll be smooth.

Don't ask me how as I haven't done it, but this is what I have been told when I had mine done.

 

match them to the manifold sizes and knife edge the bridge between the ports usually mark the with engineers blue and bore to that

 

sorry misread post thought you were porting heads not sure how you would get some of the joints in the manifold from memory there is a lip on the flange of the oem manifold where they bolt to the head which would be a good place to start