Just to remind that a leaner AFR usually leads to a higher EGT. BTW can you eventually mess with the VVT to make it go "Atkinson-capable" like that Toyota 8AR-FTS engine currently fitted to some Lexus models?
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Originally Posted by Baltothewolf
Or, just fabricate a pipe to swap out for the cat so you don't have to worry about it, and when you gotta smog swap it back.
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Probably would need to revert to stock tune in order to get approved on the smog test anyways.