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I know there is a ton of tuning threads, looking to see if anyone has heard of p1 tuners or (mustang doctor ) for tuning I know of all the big name companies already

So I’ve heard flex fuel tunes are bad but I haven’t been told why I’m trying to figure wether I should bother with a flex tune or just go full e85 and just buy the drums of it… also has anyone heard of or been tuned by p1 tuners?