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we ran it on the dyno, it maintained fairly safe AFRs. I drove the car in that form for a few weeks as well, felt solid, no CELs, no knocking. The 2nd cat is AFTER the last o2 sensor, so really, it doesn't change what the first and 2nd o2 sensor are seeing. I think it's safe, and I've bet my 30k car on it.
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First white BRZ in the country 
Limited SWP BRZ, 35% tint, clear bra, Nameless Performance downpipe, axelback, headers |