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In CT it’s all about obd2 compliance. No codes, no problems. With no other changes running catless you will throw a cat efficiency code. Running high flow, you may throw a cat code. The fix is to flash (not 100%) this works, or change the rear sensor in some way. I will let you search.
FYI, running completely catless sucks imo. Stinky exhaust, spew emissions and not much more power than hfc. If n55 I would go hfc. If n54, you could go catless dp but leave the factory mid pipe with cats.
Factory cats not the best for power
No cat is not good either.
Some cats are just right.
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