I just returned from my local KTM dealer, I was am looking for the most MX-able dual-sport available. I was not impressed by the gigantic size of the 640 LC4. The parts manager mentioned that with a $400 turn signal kit the 520 EXC could be made street legal. He said they would even put an inspection sticker on it. We did not discuss DOT tires and mirrors but I realize they are required. I work as a gas well tender and this bike seems like it would be perfect for work and play. I have a few questions. 1. Will the 520 withstand 100-200 miles a week with proper care? 2. Could a simple revalve of the suspension make it MX worthy? 3. Motor-wise, what are the differences between the 520 SX and the 520 EXC. This will be my first KTM, any help will be appreciated. Thanks, Kevin.