I just had a set of A/T3W (stock size 265/70-17) installed on a set of FN F(x) PRO wheels with my current stock suspension. [Dustin @ FN Wheels is great to deal with BTW!]
Ever so slight rub on the front mud flaps when almost fully locked left/right. The Falken's patch profile is a bit more "square" [aka aggressive!] as compared to the roundness of the stock Dunlop AT20's. I did the usual "heat up the plastic" mod to press in the mud flaps in a bit. The mud flaps aren't perfectly seated in to the wheel well and maybe even some double sided tape behind it could pull it away from the tire more. Kind of like they matched up the screw holes for the mud flap but that caused the middle to bulge out a bit into the wheel well.
A heat gun and a spackling knife seems to have worked without having to remove the mudflaps and I assume after a few hundred miles, the "edges" of the tire will wear down a bit and give a little more clearance when turning... until I rotate the tires and have the same issue with the rears until their edges are sufficiently worn down.
So far, impressions of the tire are great. Awesome looking and not that much noise increase over the stock. Noticeable but not annoying but heck, it's an AT tire, not a road tire.