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i mean i have a jb3 and before i put my DCI on if i had the music off and windows open i could def hear the turbos spool up and release upon accelerating or load. i drove around for 3 months with a tune only and could hear them with no codes or errors not loudy but if i listened for them i could def hear it. but now with the DCI i hear them very loudly and love it.
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