porting the exhaust....

[thehookeup]

so as i understand it you dont want to have a exhaust port and a wxhaust manifold that are gasket matched, you want to have a "step". with the exhaust port being smaller than the entry into exhaust manifold. i guess it helps with the the exhaust pulsation, making sure that the back pressure doesnt push back into the exhaust port.

im just wondering if this is a big deal, or if i can enlarge the ports to the same size without affecting the plusation of the exhaust gases its on a ej22t stock heads and stock exhaust manifold...