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Originally Posted by RallyBob
While 2.5" might be perfect for a stock engine application with bolt-ons, it does not address the potential that a modified engine has. So saying that 2.5" piping is the biggest you should run is somewhat of a blanket statement that does not hold true in all cases.
For example, IF you are running a ported head, higher compression pistons, a custom header and exhaust, an SR20 TB, and other modifications, then the 3" inlet pipe is the better choice.
Bob
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That's true, thank you for the clarification. The article only applies to stock and bolt-on mods. Of course serious modifications such as ported heads, cams, pistons, etc. would require a bigger inlet because simply the 2.5" inlet would be to a point where it would be restricting airflow. Thanks for the heads up!