My EFI is a bit louder than stock, but not nearly as loud as some of the other aftermarket silencers I've heard.
The upswept exhaust is the only one that I've heard of that has a persistent habit of falling apart. They are louder than my EFI.
I've got over 10,000 miles on mine and it still works great. It's got a bit of coloring on it, but they all get some. I'm not sure where mine came from. It was ordered form Nfield gear and is supposed to be English. It has no markings on it. Some of the English EFIs I've heard of have removable baffles in them, mine doesn't. They are fairly loud by the reports I've gotten, but I don't know if that is avec or sans the baffle.
Mine has yet to even rate a second glance by cops. I got stopped once because I hadn't received my license plate yet, and the cop made no mention of the pipe, and he was trying to find a way to write a ticket.
usually when I ride by one, they don't even notice me. The EFI has definitely improved the performance, a fair bit, but it's still about middle of the pack vs some other louder pipes. But don't go by hte noise, some of the loud ones aren't as quick as mine.
I would like to hear yours though! Yours does look nice, though.
Bare