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There is definitely added smell by deleting the header cat, but no where near as nasty as fully catless. I mostly notice it in colder weather under harder throttle when I crack the window. AFR is richer which makes sense.
Fully catless is near unbearable by comparison in the same exact condition. the entire cabin reeks of fumes, where the single cat I get a bit of a smell but it doesn't linger and goes away immediately
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