Most mods just tweak numbers in an .ini file. Trackaholics rewrote the telemetry pipeline. Users of direct drive wheels (Fanatec DD, Simucube, Moza) report that Trackaholics GTR2 has better FFB than most modern sims.
You might think an 18-year-old game has a dead multiplayer scene. You would be wrong.
The Trackaholics GTR2 community thrives on SimRacing.GP and dedicated Discord leagues. Specifically, look for The Pinnacle Racing League and Gentlemen Racing Club.
Because Trackaholics fixes the netcode prediction, online racing is surprisingly stable. Unlike modern sims where lag causes "ice skating," Trackaholics relies on deterministic physics. If you see a car twitch, it's because the driver actually twitched.
You might ask: why mod a 2006 sim? Three reasons:
Trackaholics took advantage of these strengths, giving players new scenery to enjoy them on.