the 472 is great
but as far as mpg i havent a clue
.
it has good driveability but it takes a lot of tuning to get it there.
the flowmasters sound great in the video but a little more tinny sounding in real life and the magnaflow sound a lot fuller than they do in the vid(not to mention the open exhaust is a lot louder!)
best my video camera can do but you can judge the difference atleast.
im quite happy with the magnaflows they have a full deep sound, flowmaster sound great too......more old school.
my biggest complaint with them was the drone on longer runs