A couple of things to reply to your replies. Firstly, i might have said it wrong but what i meant is that when you Add a SERT, then dynotune the bike you most likely bring the relability into question because there is a big difference between fine tuning and tuning. Obviously when you do fine tuning you have a harder time keeping the fine tuning fine and thus you need to tune the bike more often. You can not persuade me otherwise because my other bike is finely tuned with tons of MODS and i know from first hand experience what this means in terms of keeping it finely tuned. Secondly. the V&H Fuel pack unplugs, so it won't affect warranty. Changing mufflers, head pipes, cams and air filter does not affect warranty at all so whoever said ANY MODS at all changes the warranty is wrong. Just look at the H-D parts book, and other than chrome it's full of upgrade parts without the double checker flags. I have never seen nor have i ever heard of any warranty issue because someone decided to change their pipes or put in a performance air cleaner; I doubt any of you have either. Looking back at the original question in this thread, the writer wanted to know opinions on the fuel pack. I never said it was the best performing upgrade out there, I simply tried to convey that along with the other things i mentioned, it was the best choice that doesn't affect warranty IMO.
Let the debate continue...........