JB4 for BMW S58 Motors (G80, G82,G83 M4 + G87 M2)

⚡ JB4 Performance Tuner | BMW S58 | G87 M2, G80 M3, G82 M4

The JB4 is the ultimate plug-and-play tuning system for S58-powered BMWs, delivering up to 150whp / 175wtq on high-octane or E85 blends and 80whp / 100wtq on pump fuel. Whether you're stock or fully modified, JB4 transforms your driving experience with unmatched adjustability, safety, and integration.

🔧 Key Features

• Massive Gains: +80whp/+100wtq (pump gas), up to +150whp/+175wtq (E85/high octane)
• 8 Preloaded Maps: Tailored for various fuel types and mod levels
• Boost-by-Gear Control: Adjustable for 1st, 2nd, and 3rd gear launches
• CANbus Integration: Real-time diagnostics, fault code reading/deletion
• Smartphone & PC Connectivity: Tune, log, and update via JB4 Mobile or BMS data cable
• Ethanol Support: Full compatibility with E85 blends
• Quick Install: No wire cutting, fully reversible, not VIN-locked
• Durable Build: Billet aluminum enclosure, 5-year warranty

📱 App Features

• View and log up to 40 engine parameters
• Switch maps and update firmware wirelessly
• Requires separate JB4 Mobile app purchase

✅ Vehicle Fitment

• BMW M2: 2023+ G87
• BMW M3: 2021+ G80 (incl. Competition)
• BMW M4: 2021+ G82/G83 (incl. CSL, Convertible)

🧠 What Sets JB4 Apart

Unlike basic piggybacks, JB4 uses advanced sensor integration and CANbus control to deliver smooth, factory-like drivability with race-ready performance. It’s the gold standard in turbocharged tuning—designed, assembled, and supported in the USA.