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Originally Posted by noshun
They are the same thing but different car mfg call them different things for different years. b4 95 they were ECM but then became PCMs. I think you mean match porting which is where the intake port and manifold are made to be as seamless as possible so it doesn't disrupt the airflow. The same for the exhaust side. the intake port is usually a little smaller than the appropriate manifold.
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What are some possibel draw backs to port matching. I mean is it going to make my car suck gas or are there no real draw backs? Does it really matter if I get a crate engine or just swap for a used?