I'm the one with the fastest 2nd Gen so far. Eventually someone will go faster only a matter of time and I hope they do.
I am using the JB4 on Map 3, but I am running E45 to get 98/100 Octane (Half E85 and Half 93)
I just have the JB4 and Michelin 4S tires. Car is 100% stock mechanically.
I do have a fully optioned out car which is about 70lbs lighter between the rotors and roof.
Video of some of my runs
https://www.youtube.com/watch?v=tdeSa-w8Vzo
https://www.youtube.com/watch?v=9bC_wvymPEs
As for service I do my own oil changes and Twin Motor Unit fluid change so I haven't crossed that bridge, but if something serious was an issue I would remove before going to an Acura dealer just to be safe. Some dealers are ok with mods and others are not.
I haven't had any issues with the JB4. It was installed October 2019 and I've put maybe 4,000 miles on the car since then.