I bought my first Harley a little more than a year ago. Bought it from a car dealership ( they still send me notices that it's ready to be brought in for service...yeah right!). I didn't know anything about HD, and still learning. Once home did alot of searching through J&P and HD trying to figure out what grip was what, pipes from where, etc...etc.. EFI unit, found a DFO unit added on the 4 or 5 switch pot variety. Question is this. How could I find out what all has been done to the bike in places I can't see? Could a good dyno guy tell me if work has been done to internals?