a mechanical mod
Some time ago this rig would have carburetors but now it would only have FI
expensive and risky
A new Ural with aftermarket exhaust.
"a mechanical mod" could be several things, but aftermarket exhausts are the most common one done to a motorcycle.
"Some time ago this rig would have carburetors but now it would only have FI " suggests time periods and availability.
"expensive and risky " somewhat subjective, but new Urals aren't cheap for sure, and not being a Honda, there's a greater risk of having issues.
I've noticed that new bikes often have a bit of extra zip on the very top end that fades a little bit as they break in and gain performance across the rest of their power band.
That's all I have as it reflects my experience and observations within the confines of the presented parameters. Realistically there can't be a "correct" answer as we all have unique circumstances and experiences.