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I dont think it would matter with the stage 3 thing but as far as your O2 sensors.... i think they would go crazy with no cat.
 

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HNNLIC
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You'd want to get a high-flow cat to add to that system. Otherwise you'll get a CEL regardless of what ECU stage you get.

Cats can be found from $40- $90, and can be installed by any exhaust shop.
 

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with a high-flow cat there is almost no difference in perfornance or sound (this is what ive been told... im not sure about it tho)
 
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