I am trying to determine if the Performance Break Package will interfere with smaller wheels for winter and couldnt find any information anywhere (Dealer/Ford CS/Tire Rack). Stopped by my local dealer and they just received their first ST with the larger rotors. It looks like maybe there is 2.5-3" space between the wheel and the caliper. I was surprised that it looks like only the front rotors were upgraded and the rears were the same size just with the painted calipers.
On a side note, I was going to check the size of the spare (listed as compact on various websites) but low and behold...only an inflation kit and no spare tire.
Worth trying upstream fixes first as omar referred to earlier - plug change, coil change (or at least resistance verify), Techron Concentrate Plus or BG 44K, even Cataclean. MAY clear up on its own may not. If the problem originated upstream, which is very likely, then the new cat will go down the same road. Pulling the plugs will at least tell you whether this approach has value.
When you are tuned and revert back to stock. Soft codes are thrown (Forscan can remove them) though your miles since flash, key strokes since flash...etc etc all reset back to 0. So if Ford wanted to be picky and you come in with 10,000 miles and 2 key strokes, they know somethings fishy. With all that said. I had a cracked transmission housing and after 6 long months of my car at the dealership back and forth saying they fixed it and it was still leaking. My car went in with the tune on it and they replaced my housing as they said it was irregular from the factory. Livernois has the fastest Edge Sport in the 1/4. You wont be disappointed with them and is probably a 100% better option than the JMS product