I have heard alot of mention about porting the exhaust headers. Basically what I want to do is remove the manifold. Clean the carbon off the manifold. Then match the manifold ports to the ports on the head using the gasket as a template. I will also polish up the manifold ports as much as possible until they are nice and shiny I wont be taking the head off and apart to gasflow this since I dont want to go this far.
A lot of Subaru owners swear by doing this and say it makes a noticable difference. The big question is will this make any difference or is it just a case of feel good factor knowing everything is aligned and shiny What is the alignment like between the head and the exhaust, is there a great big step there or is it ok?