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Discussion Starter #1
Had the car since 2013. Whenever it's under load 4k RPM plus I hear a whistle sound and it seems like it gets louder in VTEC. I've checked the intake and vacuum hoses and the seem fine. Car doesn't seem to have any performance issues. Sound seems like it is coming from under the hood possibly the exhaust. Can't really diagnose the exact location since it only does it under load. Any ideas?
 

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Try checking for any exhaust leaks and possibly a cracked header.

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Discussion Starter #3
Did some more poking around the car as well as more research. It is the muffler itself causing the whistling!
 
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