Looking to hop up my 700EFI, starting with exhaust system. Have read past threads but would like some updated info. Have looked at the Aaen, HSP, and the stock 800 head pipe w/the Pure Polaris White Brothers silencer. I couldn't find a part # for the Pure Polaris one on-line except for the ones listed for the Predators. Looking for most power output and lightest weight and needs to have or be able to use a spark arrestor. If anyone knows or has used another manufacturer please feel free to comment on them also. Thanks.