I dunno about euro3 but i love mine.got like 3500 miles and she rips. The 750 is vry usere friendly the 600 is as well the 750 just has a bit more spark. either bike would be awsome to ride and are very light and with the slipper clutch very friendly with down shift error. I would go with the 750 just for the xtra power. And as far as the ehaust both of the bike run the exact same exhuast so as far as that goes anything made fore the 600 will fit the 750 as well. The bike are brand new so there isnt a ton of accesories yet.give it a year. Arrow Yosh D&D Leo and Aprov all have exhausts for the 600 and 750? Well you need to just go and sit on some and ride some of your friends bikes and find what you like.