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Here is my stock log showing my car warmed up idling fine with the LTFTs -12% to -13% but the short term fuel trims are perfect almost at zero. This means the car is completely happy and running correctly. At least in closed loop.
And the second photo is the log from my car with nothing but the rotofab added. No tune change or anything, still all completely stock same gas and everything. Here you can see the LTFTs are better. Closer to zero. More air going in means more fuel is needed and not as much pulled out from the factory airbox restriction. So the fuel trims are doing their job, and the shorties are still happy at zero-ish.
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