Where to start? Below are most of the mods I have personally tried over the years, some more effective than others.
Helibars – Good price conscious comfort mod, solid construction. Not much in the way of adjustability. Does not mitigate vibration. Does not, by itself require custom brake lines, but highly recommended.
Genmar Riser plate. See above. Does not, by itself require custom brake lines. I combined both the Helibars and Genmar with good effect, but does require custom brake lines and some other mods to reroute fast idle and clearance the windshield etc.
Crampbuster – Great price conscious comfort mod. I went from the wide one to the narrower one and find that once adjusted it does provide a way to maintain throttle position, while loosening your grip so you can get things circulating again.
NEP Throttle lock - Great price conscious comfort mod. I have used one of these for the better part of 40 years now and have no reason to stop. No modifications necessary. Set it and let go, thumb it to release. Others are running full automotive CC on their bikes with great feedback so that’s an alternative.
Heated Grips – Great price conscious comfort mod.I have the Heat Demon version on now. These allow you to run whatever grips and gloves you choose so I prefer them to heated grips. Warm hands are happy hands IMO! Great to enhance circulation. Only mods necessary are the wiring.
CRG Levers – Good, not so price conscious comfort mod. I went with a long Clutch lever and Short Brake lever due to sitting in traffic a lot and a long clutch lever helps a lot for that. No mods necessary.
Bar Weights - Great, not so price conscious comfort mod. This aint for everybody, but if you want to absolutely KILL vibes this is where you start! The set I have (not currently installed, more on this later) were made for me from Solid Brass. They weigh about 8oz or maybe more each so, like I said they aren’t for everyone. I rode for a long time on a few different motorcycles with these and it wasn’t until recently that I quit using them.
Corbin Seat – Good, not so price conscious comfort mod. I bought mine used from a board member, rode a lot of miles on this seat stock until I decided to install a Gel insert in it last summer, even better now! No mods necessary.
Buell Foot pegs - Great price conscious comfort mod. This is one of those must do mods for tall dudes. Only mods necessary are adjusting your pedal heights after install. I am leaning towards a set of the Knight Industries pegs just have had no good reason to thus far.
Tubular Bar- Good, not so price conscious comfort mod. As I mentioned above I rode for a lot of miles with my Helibar/Tall Genmar riser and had no real complaints about that setup. But it is not adjustable so I decided on a Tubular Bar. I chose to go the Fatbar route via a CNC Topyokes upper and a Renthal Streetfighter Bend Fatbar. In doing so, I no longer found the need to run my uber heavy brass bar ends with this setup. They do a great job of eliminating much of the vibration present with the others mentioned. You will need custom lines (mine are +4”) for this mod, as well as windshield mods etc.
Windshields - Good, not so price conscious comfort mod. Some folks are fine with the stock shield or even a double bubble, and in fact I had a double bubble on mine until right now. I just bought an MRA Vario Touring Shield to try out simply because I got the bug to give it a go. Previously had great results with the ZG Sport Touring shield as well. Will report on how the new one works when I get around to fitting it up.