Can't answer your question but I can offer an FYI that was mentioned in another response.
Few years ago we were hit while stopped at a stop sign and our cart totaled. One of the 1st questions the insurance adjuster asked me was if the speed had been adjusted higher because insurance might not cover us even though the accident was not our fault.
This is not meant to influence you just an FYI.

Thanks!

I would tell your friend not to do it.

It will NOT affect "drivability at low speeds". However, driving at speeds above 19 mph, WILL negatively affect the following:
Braking time and distance will be increased.
Steering will be compromised.
More stress on the clutch internals.
More wear on the drive belt
Might cause more wear to the engine
Wallet might feel a little lighter

I adjusted mine. It only took about 10 minutes. No effect on anything other than my ability to go faster when I want to pass that guy going 16 MPH.

The pundits on here assume that just because you Can go 23 you have too. My car will go 110 MPH but I control the speed with the gas pedal. Rumor has it that you can do the same in a golf cart.

Not a bit.

All the people here saying don’t do it must not be the ones I see on the MM paths. Almost everyone is going over 20 and more like 23. JMO

I believe the law is, if the cart is CAPABLE of more than 20 MPH, it's no longer considered a golf cart and insurance may be void. Not if you're going more than 20 MPH.

Whether or not you decide to take that risk is up to you.

My electric cart maxes out at 20mph. Can't go any faster unless going downhill, when the speed controller cuts in to slow it back down. Yet, I constantly get tail-gaited and passed by gas carts going well above 20mph. If the local police wanted to make a ton of money in The Villages, all they would need to do is to put in a few speed traps, and hand out tickets for unregistered motor vehicles. There is no reason to pass me in a golf cart if I am going 20mph.

Same can be said for Florida turnpike, Morse blvd, 466, 466a, the street behind my house, except not golf carts, regular cars speeding.

I was in the same situation.
The insurance adjuster never asked if the speed was adjusted.

When I bought a new 2018 Yamaha Drive2 cart, both Carts and Clubs and The Villages Golf Car store offered to set the max speed up to 22 or 23 before delivery subject to signing a waiver of some sort.

I considered making the same adjustment to my cart just in case I needed the extra speed for a quick pass of another cart. After giving it some thought I decided against it because I like to be able to just put the pedal to the floor and not have to worry about keeping my speed at or below 20 MPH. Plus, I like to keep things simple so my cart has no speedometer and no need for one since it tops out at the legal limit. The only instrument I have in my cart is an old fashioned compass, just in case the sun isn’t showing itself and I need to calibrate my direction.

Going to a taller tire will also give you a speed boost.

Governor
 

Was done for me at the villages golf cart.