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I really don't know how loud they are (or would have been). I only got to drive the car up and down my street a few short runs before the motor developed a very serious sounding knocking sound. My motor is a 12.5:1 3.8 with plastic intake plenum. My bet is it's around 100db on my motor. Lower compression and different intake systems will make different end results.
I'm asking $4,000 for the entire system, cylinder head to tailpipe.
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