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KTM 505 SX

By the Staff of Dirt Wheels KTM 505 SX What is the best high-performance quad? If you're talking about what you can buy new today then that would have to be Yamaha's YFZ450R. However, if you were going to include all quads made in the last 10 years, then you'd have to consider the KTM 505 SX. Stephane LeBlanc is a Dirt Wheels reader who owns a 2010 KTM 505 SX and he seems quite pleased with its performance. The photo of it here shows that he keeps it clean, well maintained, and in good shape. It's a shame that KTM…