performance tuning, car mechanic simulator 2021, engine upgrade, turbocharger, ECU remapping, aftermarket exhaust, cold air intake, sports air filter, high-performance fuel injector, adjustable suspension, low-profile tires, lightweight rims, aerodynamic body kit, carbon fiber hood, racing spoiler, improved cooling system, dyno test, optimized gear ratios, reinforced chassis, track-ready setup, high-octane fuel, advanced ignition system, full synthetic oil, performance brake pads, slotted rotors, engine tuning software, custom paint job, sport seats, roll cage, weight reduction, detailed engine bay, high-quality materials, realistic textures, dynamic lighting, close-up camera angle, garage environment.