I have an Aprilia RX50 racing, 2006. I have an arrow exhaust on it. it was already on there when i baught it, but the standard exhaust restricted it to 25 mph, but the full arrow exhaust kit makes it go to 55 to 60 mph. It looks alot better than the standard exhaust. They are easy to get hold of if you want one. For a full arrow exhaust system usually costs around £185. Arrow make many exhausts for many different bikes. When mine had the standard exhaust on it sound like a broken hair dryer like a standard moped, but now it sounds like a 125 cc motocross bike. I learnt how to ride it in 15 minutes, that was the first time i have ever ridden a geared motorbike. Even my dad loves it and he has a Yamaha R1 which is 20 x more powerful. All those people thinking of getting one, get an arrow. Hope this helps.
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Good review but could do with some more info to gain higher ratings. Take a look at other reviews to get an idea of the level of info that is needed to gain higher ratings. ~ Em. x