Good points to ponder for sure. I plan to swap the +4 HD Deavers for the +3....perhaps the +2 to return to stock height. Little extra height and compression would be nice, I'm not certain the lift from the +4 Deavers is the sweet spot for me.
From much reading on here it is highly recommended to do this recalibration as it makes a noticeable difference in how it handles afterwards.
It basically resets the zero and the shocks will then operate as intended from factory.
From FRF:
"Live Valve Shocks Reset:
So I got lucky because I have a local service manager that is really easy to work with. She is the same person I spoke to over the phone a couple of weeks ago that had never heard of the ride height calibration. When I showed up I showed her this information verbatim on my phone.
1. If the ride height is altered and the ride height recalibration procedure is not performed, the VDM will interpret the sensor readings as the front shocks being constantly extended, as if the vehicle is carrying a heavy load in the rear or accelerating aggressively. The inaccurate sensor readings will negativity affect the operation of the live valve shocks, since the readings the module is receiving are not accurate.
2. The IDS Service Routine puts the Vehicle Dynamics Module (VDM) into a training mode, at which point it reads the ride height sensors and records the values. The value will more than likely read 30mm but should be reset to 0mm.
3. The VCM 3 just came out, but all dealers will at least have 1 or more VCM 2s or a VCMM (oscilloscope) with IDS. Sounds like they aren’t familiar with the IDS service procedure and think that an aftermarket calibration must be used to correct the ride height sensor readings.
She said we have the VCM 3 and the tech that was going to replace my cameras would be the same tech that would be doing the ride height calibration. She asked that I text it to her and she would get it to the tech no problem.
After everything was done, I spoke to the tech and he said it wasn't hard at all < than 5 minutes and done."
The above may help a technician at a Dealership because it's something they may have never performed and may not be familiar with the procedure.