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...and the real answer is...these cars are rev limited when in neutral to about 4,500 rpms unless that feature is defeated by a tuner.

The sound you're hearing with a CAI is the engine sucking in air.

It's really not the best idea to rev any engine to extreme rpms without a load on it. You'll soon be sending pieces of your piston rods through the engine block. Those yahoos who go around revving wide open are, shall we say, unwise and annoying. It's kind of like the scene in "Enter the Dragon" when the caucasian guy tries to impress Bruce Lee by hitting a board and breaking it. Bruce responded, "Boards don't hit back." High revving doesn't impress those who know better and, in fact, only proves the person doesn't really understand what they're doing.
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