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Volume difference stock cats vs FI HFC

I just bought a Z with the Fast Intentions cat back exhaust (18” resonators) and resonated high flow cats. The car is a little loud for me, does anyone know

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Old 03-24-2021, 10:19 PM   #1 (permalink)
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Default Volume difference stock cats vs FI HFC

I just bought a Z with the Fast Intentions cat back exhaust (18” resonators) and resonated high flow cats. The car is a little loud for me, does anyone know how much quieter it would be if I returned it to stock cats? The cats look a bit corroded, is there still resale/trade value?

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