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Adding a Cat, Do i need a tune?

Old 07-06-2019, 09:21 PM
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Adding a Cat, Do i need a tune?

I bought an 06 Stage 2 cobalt sc and I believe it has a ZZP catless exhaust. I need a cat to pass inspection so I was gonna have a shop add one on. Will I need a tune after that? Right now there's no codes or anything.
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Old 07-07-2019, 10:28 AM
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For optimal performance yes, but adding a cat will not require a tune unless it's a really poor flowing one.
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Old 07-12-2019, 10:08 PM
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Originally Posted by ECaulk View Post
For optimal performance yes, but adding a cat will not require a tune unless it's a really poor flowing one.
Thanks for the reply, I will probably get a tune eventually once I pass inspection but its good to know that I shouldn't expressly need it.
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