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Discussion Starter #1
went to an exhaust shop ask about high flow cats they said they dont do nothing for you,went to another one and they said they help out alot,opinions are appreciated
 

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they help by increasing flow. hence hi-flow cats. the stockers suck. with hi-flows you get a better sound. better flow never hurts
 

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High-Mileage 4.6L Thrasher
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Don't forget how old your car actually is. Replacing the old cats with new ones helps and using better flowing ones helps set up a good foundation for future mods. I replaced my cats and oxygen sensors recently and noticed better fuel mileage as well as better acceleration.
 

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Discussion Starter #6
i ended up with the high flow cats

did anyone remove the third cat and have like a pop noise when they rev up??
 

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i ended up with the high flow cats

did anyone remove the third cat and have like a pop noise when they rev up??
my buddies have that problem i assume you're running with no mufflers. if you had mufflers it would tone it down a whole lot.
 

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Discussion Starter #11
i know mine are high flows

im sure since their mufflers are better than stock that all their cats are better than stock
 
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