If I am asking a dumb question then please forgive! I have a Ducati Desert Sled. I have fitted a booster plug which has smoothed out the bike a lot. I keep looking at the restrictive airbox though and the huge lump of a catalyser and thinking that allowing it to breath better at both ends has to improve things. Also it frankly doesn't sound like a Ducati. So here is the stupid question: Presumably all the exhausts I see advertised involve removing the cat? Well.....isn't that illegal for road use? Aren't the fines sort of huge?