The only concern I have about the FI's clearance is that the front of the can-style mufflers could catch on an obstacle like a speed bump or even a really crappy road.
I had side pipes on one of my Mustangs and ripped the right side pipe off when it caught on a speed bump...
I would be inclined to weld some sort of cover down there to prevent this from happening (if it's really going to be an issue.)