^ Aero conversion is a great idea!
I don't mind the suggestion of using the new 300hp+ V6 used in the new mustang, would be very unique however I can't see much in the way of future performance modifications for that mill.
For a street driven fox I wouldn't touch this swap, especially not for 400-500hp goals. I'd go with the hotly contested LSx swap long before ever considering a BBF. :eek:
I had their regular mufflers for a bit on my car, the idle sounded good but they were incredibly raspy otherwise. I have the pypes x pipe, fits well IMO, I have not had any issues with it hanging down too low either personally.
I would not bother with walker factory replacements personally, they will sound well...stock. The Dynomax VT recommendation I do like however for a fairly tame but good sounding setup.
The key to a nice sounding exhaust IMHO is to have tailpipes regardless of what muffler/crossover configuration you choose. I was into dumps when I was a teenager, then I got over it.
I have a set sitting in the box that I started stripping a while back, I attempted installing them when I was swapping in a rebuilt T5 and within 15 minutes I just put them back in the box and bolted the MAC shorties back up.
No kidding, I picked up a pair of Mach's with tires for $220 a few years ago and could not find another 2 to make a complete set for a reasonable price! They are just collecting dust now.
That looks great, I'll add that my cars brakes after the front PBR upgrade (stock drums rear) with stock booster/master feel much better than stock components.
Somewhat related question, what spring setup are you running? I like the stance.