New Dirtbikeparts now here today we have some performance upgrades and control upgrades that are both easy to do and they're cost effective the exhaust that comes stock on your brand new Dirtbikeparts is going to be made to meet very strict bpa guidelines which is not really good for performance so what we do suggest is the FMF factory 4.1 anodized full-system exhaust now the blue anodized titanium muffler with the carbon fiber end cap is going to make this extremely lightweight it's also.