i have the hydraulic tensioner upgrade in my 02 fxdx and so far so good with just shy of 30k in a year. the only thing that concerns me is running the old silent chain on the rear with a new hydraulic unit. i will find out how it works out when i tear it down next month sometime.
If you dont want to do the hydraulic tensioners just replace the old ones with the same spring loaded tensioners, replace the cams with a bolt in cam like the s&s 510 as chopper said. no need to go bigbore if you dont have the cash. your bike will be like night and day with just a good set of cams, ign, pipes and aircleaner, plus you have a carb so that makes it even easier. I know the dealer is just trying to get you to spend more money that you dont have too. I work for one:bigsmiley11: