Is 500Hp on a B48 Really achievable?
In this guide, we break down the full cost and components required to build a 500+ horsepower BMW 330i using the B48 4-cylinder engine. Whether you’re looking for a reliable street setup or a full-performance daily that punches harder than an M car, we’ve detailed two proven build paths below:
💸 $6K Entry-Level Build (~380whp on 93 Octane or E50)
This build is perfect for those running pump gas (91/93) or light ethanol blends (E30–E50). It’s simple, responsive, and ideal for spirited street driving.
| Component | Description | Price (USD) | Buy Link |
|---|---|---|---|
| Turbo (IM450) | Full-frame turbo, fast spool | $2,650 | New (Affiliate) / Used |
| Downpipe | High-flow or catless | $320 | New (Affiliate) / Used |
| Ecutek Tune + License | Flash tune, no PI support | $1,500 | Racebox Tuning |
| Charge Pipe | Optional metal pipe for reliability | $250 | New (Affiliate) / Used |
Total Build Cost: ~$5,900
Estimated Output: ~360–380whp / ~400–430wtq
🔥 $11K Max Effort Build (~480whp on Full E85)
This setup mirrors the YouTube build: full E85 fueling, port injection, better cooling, and all supporting mods. Designed for performance, reliability, and back-to-back pulls without heat soak.
| Component | Description | Price (USD) | Buy Link |
|---|---|---|---|
| Turbo (IM450) | Compressor mod + install kit | $2,750 | New (Affiliate) / Used |
| Intake Manifold (IPOS) | Optional powder coat, optimized cooling | $2,750 | New (Affiliate) / Used |
| Downpipe | High-flow or catless | $320 | New (Affiliate) / Used |
| Charge Pipe | Required due to PI plate spacing | $250 | New (Affiliate) / Used |
| Port Injection + Injectors | 550cc injectors + PI plate | $600 | New (Affiliate) / Used Plate, Injectors |
| Motiv Reflex+ Kit | Controls PI + integrates ethanol sensor | $1,258 | Affiliate 1 / Affiliate 2 |
| Fuel Kit + Ethanol Sensor | Includes flex sensor, tap connectors, pressure safety | $200 | Fuel Kit, Sensor, Tap Kit |
| Heat Exchanger | Prevents heat soak on repeated pulls | $500 | Buy New (Affiliate) |
| Ecutek Custom Tune | Bluetooth + full PI/flex fuel tuning | $2,420 | Racebox / YouTube |
Total Build Cost: ~$11,148
Estimated Output: ~470–480whp / ~500–520wtq
🛠️ Optional Used Components for Rebuilds or Swaps
If you're rebuilding or converting a 330e/320i, consider these used parts to complete the transformation:
🧾 Final Notes from RPM Tuning
At RPM Tuning, we believe in transparency and real-world performance. This build was tested, proven, and driven hard for thousands of kilometers without failure. Whether you’re planning a mild street upgrade or a serious build, our team is here to guide you on part selection, tuning, and support.
Need help building your own G20 330i project?
📍 Visit us in USJ 1 or Contact RPM Tuning
Let’s unlock the real potential of your B48.
Have questions about tuning, staging your build, or compatibility? Reach out to us on whatsapp.