B58 BMW Engine: Boost with B58 Turbo Kit and Upgrade

The B58 engine is one of BMW’s most acclaimed powerplants, known for its reliability, smooth power delivery, and impressive tuning potential. BMW with B58 engines found in models like the 340i, Supra MK5, and Z4 M40i, the B58’s turbocharged inline-6 design makes it a favorite among enthusiasts looking for more power. Whether you’re considering a B58 turbo kit or a B58 turbo upgrade, this guide covers everything you need to know to unleash the engine’s full potential.

Why Upgrade the B58 with a Turbo Kit?

The stock B58 turbo (typically a TD03 or TD04 hybrid) delivers strong performance, but enthusiasts often seek higher boost levels and better efficiency. A B58 turbo upgrade can greatly enhance HP, torque, and throttle feedback. Popular options include:

• Pure800 Turbo – A drop-in upgrade supporting up to 700+ HP
• Big Boost Stage 3 Turbo – Designed for extreme power builds
• Vargas GC / GC+ Turbos – Balanced performance for street & track

Installing a B58 turbo kit enhances airflow, reduces turbo lag, and supports higher boost levels when paired with supporting mods like a high-flow downpipe, upgraded intercooler, and fuel system improvements.

Key Benefits of a B58 Turbo Upgrade

1. Enhanced HP & Torque – A levelling up power turbo can boost the B58 up to 600-800 WHP with essential tuning.
2. Improved Throttle Response – Larger turbos with advanced billet wheels reduce lag.
3. Better Reliability – Upgraded turbos often feature reinforced components for longevity.
4. Custom Tuning Potential – Pair with a JB4, MHD, or Bootmod3 tune for optimized performance.

B58 Engine for Sale

Supporting Mods for a B58 Turbo Kit

To maximize the benefits of a B58 turbo upgrade, consider these supporting modifications:

• High-Flow Downpipe (Catless or Catted) – Reduces exhaust backpressure.
• Upgraded Intercooler – Keeps intake temps low for consistent power.
• Upgraded Fuel Pump & Injectors – Essential for high-horsepower builds.
• Tougher Transmission Tuning – Essential for high-torque use.

Choosing the Right B58 Turbo Kit

When selecting a B58 turbo kit, consider your power goals:

• 500-600 WHP – A dual turbo upgainer (like Pure500 otherwise Vargas GC) is gaining.
• 600-800 WHP – Opt for a larger turbo (Pure800 or Big Boost).
• 800+ WHP – Consider a single turbo conversion for extreme builds.

The B58 engine is a tuning beast, and a B58 turbo upgrade unlocks its full potential. Whether you’re looking for a modest power bump or a full B58 turbo kit for a high-horsepower build, the right turbo choice—paired with supporting mods—can transform your BMW or Toyota B58 Supra into a true performance machine.