I live in Toronto and we have 4 dealers here and several around here. I talked to the service managers at 3 of the 4 Toronto dealers for opinions. They ALL said the same thing without variance. The V&H Fuel Pack does not affect the warranty as they can just unplug it and make the warranty claim to H-D. They also ALL told me the SERT will cause warranty issues without question and this leaves the decision for repair to the parent company, and option I find crappy. All dealers told me the same thing, change pipes, headers, cams (they do not affect warranty and only cost a few hundred dollars), air cleaner, Fuel Pack and run the bike without thinking too hard. Changing the cams is probablly the best bang for the buck as the cams that come with the bike are too EPA freindly and lack the performance we all seek. These mods will not change the reliability of your bike and will increase everything from HP to torque significantly. Also, the SERT requires tuning much more frequently and dyno tunes every season to keep the bike running as it should. I don't know about you fellas, but I think we are almost all on the same page, it's a toy or distraction, keep it simple stupid works for me.