I'm not really all that articulate... i pulled the product description off of jdmtheory.com. They sell this piece for 335 bucks, I'll let mine go for 120. I have had it on my engine for quite some time, but it's still in perfect shape.

http://shop1.jdmtheory.com/product_i...f1bfa684528e41

Racing engines are machined with extreme precision and feature filled-in intake ports. This is done to make use of the venturi effect a fundamental of fluid mechanics. By smoothing a portion of the intake port and making it narrower, it is possible to increase the speed of the air-fuel mixture. By simply inserting this component between the cylinder head and the intake manifold, it is possible to obtain the optimum port shape for the above-mentioned venturi effect. When the speed of the air-fuel mixture is increased in this way, the efficiency of combustion inside the engine is improved and power increases accordingly.

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