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Originally posted by Bolo
I just recently ported the exhaust side on my sr. But I didn't port each individual runner, only where the manifold meets the turbo and where the turbo meets the elbow. I ported the openings to match the gaskets and just tried to smooth out everything in there.
Now the turbo spools up much quicker with almost no lag! And there is a very noticable difference in drivability as the power comes on a lot sooner at lower rpm's. I highly recommend porting, especially on turbo cars!
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Port matching on the exhaust side is supposedly not as good.... the site I listed in my first post warns against it unless it's absolutely necessary.
Quote from that site:
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In most cases, you never port match the exhausts. Many stock exhaust manifolds and virtually all tube headers will have larger port sizes than do the heads. You want that "step" from the port to the larger header tube or exhaust manifold because, as pressure pulses flow back and forth in the exhaust system, it acts as a "reversion dam" by resisting back flow of exhaust gases into the port. If you end up with the rare situation where the stock exhaust manifold has ports smaller than those in the head, you will need to port match.
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