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exhaust + cats anyone?

Hi flow cats claim 15-20, cat back exhausts claim about the same. Do they add if you get them both? Anyone done Stillen or FastIntentions high flow cats and cat

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Old 05-28-2011, 01:28 AM   #1 (permalink)
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Default exhaust + cats anyone?

Hi flow cats claim 15-20, cat back exhausts claim about the same. Do they add if you get them both? Anyone done Stillen or FastIntentions high flow cats and cat backs with a Dyno run? If they add, it should be 30-40rwhp.
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Old 05-28-2011, 01:31 AM   #2 (permalink)
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1+1 doesn't equal 2. It's more like 20-25 whp based on others who have done exhaust+cats dyno.
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