Standard Mods?

[Gnasher]

Change the spark plugs for some iridium ones.  I did recently and the difference was very noticeable.

There's no performance improvement over serviceable standard copper core plugs.  This has been gone over and over, iridium plugs just last longer, you will feel an improvement if the plugs they replaced were at the end of their service life but no more than if you fit new copper core.  Of course it's personnel choice and it's your money to throw away they cost approximately twice as much as chopper.