I have the jba cat less down pipes on my z and love it. I want long tube headers now but it is really loud now the cat do kill a lot of sound you will need a tune to turn off the cel the stock mufflers do a great job of making it quiet on the highway at cruise it's not much louder at all when the valves for the mufflers close sounds very close to the same as stock
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2012 ZL1 & my wife
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