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Discussion Starter · #1 ·
I'm planning on replacing the midsecton pipe that runs from the cat to the muffler as well as replacing the stock cat with a high flow cat. I currently have a CAI, Header, Pulleys & TRD muffler and I was curious if anybody else has ran a larger diameter pipe with a high flow cat and how it affected their performance. Thanks guys.
 

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The Original 1zz Fanboy
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I have a high flow cat. I was thinking of replacing the midsection of pipe between the cat and the trd exhaust too. I'm not sure about gains you would get. I've been real curious about what you can expect. My other power mods are the same as yours so I want to know too.
 

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and where can you get one?I got dual's and that has similar effect to increasing diameter(less rsisitance) you just need to watch you don't go too bug or you will lose back pressure and torque on the bottom end.Not good for our already torque light cars!~Brad
 
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