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I was stock ECU with Dinan exhaust prior to installing the intake. Then added the intake.
To me, there was not a significant change in sound - but I think the exhaust noise drowns out any appreciable sound from the intake. Like I said, sometimes I hear the whirling noise... but otherwise, I can't say there is a lot of difference.
Keep in mind this is just one guy's perspective. I'm pleased with Dinan and their products.
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