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Discussion Starter · #1 ·
i was wanting to put a high flow cat on and someone told me that i have two cats on there and i have never heard of any thing with two cats with just a single exhaust. i guess i am just wondering if he was right about it. he also told me that the piece that is just before my muffler is not a cat but a resonator. what is that for any way?
 

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Jack Lives Here!!!
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What motor are you running. The 03 4.0's have 3 cats on them. Two pre-cats right by the oil pan and then the 3rd where you normally see it.

My 99 4.0 has only 1 cat on it.
 

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Besides, a high-flow cat won't help performance. A bit of backpressure is useful to the engine. :)
 
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