Re: Where did you put the XFi decal?
I'm not big on stickers on my cars, but I did want to put the XFI on so I've put it under Wing (above wing motor housing), so it will be seen while driving with the wing up.
One suggestion would be a discrete window sticker that would adhere to the inside of the window, since I'll prefer to put it on the small window, behind the driver's seat.
An outline of the XFi logo is what I was "thinking of"...just a thought to share.