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Tune for Cat Delete?

Practical Reflash Tuning

Discussion and questions related to the course Reflashing


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I am currently working on my tune now on my 2012 Honda Civic Si with FlashPro. My air fuel ratios are good and timing is optimized, but I just removed both my cats and installed the Skunk2 Catless Downpipe last night. Is there anything I need to adjust in the tune? I already tuned it for my Intake, and catback exhaust. A few people mentioned low end might be slower because of no back pressure? Is this true?