Honda CBR's are the top sellers in the sport bike niche in Spain. They may not be the fastest, or the lightest, but they are great all-rounders. Buyers can buy the CBR600F, a fast sport tourer, or a CBR600RR, a radical SuperSport. To what I know, the other three just offer a version of their bikes.
To what I know, after Suzuki released the Hayabusa the four japanese makers agreed not to build any bike that will exceed 300 km/h (180 mph). There was some lawsuits back then because of the advertising promoting reckless driving, but I think the four makers wanted to put an end to the competition on who will build the fastest bike. 180 mph is enough, and it doesn't make sense to make something faster than the Super BlackBird, a bike whose limit almost anybody can reach.
FWIW, "Hayabusa" is the japanese name of a falcon that can reach 180 mph when diving for attack, and also have among its prey the blackbirds...
Regarding the exhaust, if it's not the four-into-four, I love a big, thick sport muffler pointing skywards from the right side of the bike. I don't like the new trend of hiding the mufflers below the seat. The Suzuki GSX750F whose picture I posted is one of my favourites. The problem with that, as with many Suzukis, is that it doesn't stand a closer look. The quality of finish -much plastic and fake chrome- is lightyears away from Honda, in my opinion.
Raul