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General Engine Management / Tuning Forum Discuss general EMS tuning concepts that do not pertain to a specfic brand or product.

putting a cat back on the car, reflash needed?

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Old Aug 11, 2008 | 01:21 PM
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theblue
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putting a cat back on the car, reflash needed?
I currently have a full 3" exhaust with no cat and a ECU reflash. If I keep everything 3" but add a cat back in... how far off will my ECU tune be? do I really need another reflash?

thanks.
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Old Aug 11, 2008 | 01:24 PM
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No you'll be fine. It will be off slightly though.
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