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Cary likes when you keep your cats on, so he's safe from the Smog Police. You could always take your cats off after, and flip the BM3 switch. Our cats flow great anyway, so it's no biggie. I personally recommend F80Paul's tunes, and I've done 4 so far, all safe and very powerful.
Bend, yes you get a filter. If you're not doing mixed fuels all the time then you could pick a single tune, which is cheaper than flex, and can hit higher numbers since it's intended for E85 only. Some say a filter is necessary, but I ran my F80 without one. I have one on my F82 since it was part of the LPFP plumbing but I would have skipped it.
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'18 F80 Base 6MT | '19 F82 Exec DCT | '18 F82 Comp Exec DCT | '23 G80cx
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