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I don't know this is your first car to have modded but i've seen this kind of post x9999999 all cars forum. if you worry about your warranty much, i suggest you just leave with stock. or swap back to stock when you need to do have inspection.
for CEL, get CEL elimnator (o2 sensor adapter) CEL will not likely on but it's not 100% guaranteed. (it goes on and off)
If i am you, i would just get open flash tablet instead of header and try E85 gas
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