The 2013 CRF450R is a great bike in most areas, but the engine department needs help along with the extra weight the dual exhaust carries. The DR.D system does just that, it trims nearly 3 full pounds off as it is the lightest exhaust system on the market at 7.9pds in stainless steel/carbon fiber. Our Titanium? It is even lighter. The performance increase will be slightly better off the bottom, carrying into a strong mid and continuing to pull farther than the stock unit on top.