If you brave the Russian forums (VK, RuTracker) or the deep web of Discord, you might find a "Repack" that claims to include the multiplayer mod. Here is what that experience realistically looks like:

My Summer Car Cracked Multiplayer offers a unique and engaging gameplay experience, perfect for fans of the original game. With its robust features, benefits, and community-driven approach, this cracked version has become a staple among gamers. Whether you're a seasoned player or new to the series, My Summer Car Cracked Multiplayer is definitely worth checking out. So gather your friends, fire up the engine, and get ready to build the ultimate car together!

Pirated versions often cannot connect to official servers used by legitimate players, limiting your pool of available friends to others with the same cracked version. Risks and Limitations

Yes, it is possible, but it requires specific versions of the game and the mod. Using a cracked version usually involves a "repack" that includes the multiplayer mod pre-installed.