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I've had mine for 1-1/2 years with no tune and it works great. My friend had his first and he went from being pretty even with me before and walking past me after. You can really hear the supercharger whine with the Roto Fab. I recently got a JRE 650 RWHP build that required a tune. The Roto Fab CAI is in that build but I already had it.
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