Custom fitted for the 2015 Dodge Challenger R/T. Easy installation. A low whistle, not annoying if you just hate engine noise. Had one of these on my 2006 GMC Sierra Denali, slightly increased gas mileage, had it on the truck for over 5 years. Just installed it on a Dodge so can't comment on increases yet, pair it with a Specter air intake. Let's see if that MPG increases in the coming months.
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