Driving a BMW 335i means you already appreciate performance. But upgrading the turbo transforms your ride—unleashing serious power gains, improved throttle response, and a foundation for a truly customized build. This 2025 guide breaks down the top turbo kits to suit your goals.
Why Upgrade the Turbo on Your 335i?
Stock N54/N55 turbos peak around 300–330 hp with decent response—but aftermarket kits can deliver 550 to over 1,000 hp. Upgrading means you’ll experience faster spool, stronger mid‑range torque, and limitless tuning potential.
Direct answer: A turbo upgrade unlocks substantially higher horsepower, sharper response, and gives you a powerful platform to build your ideal performance machine.
Top Turbo Kits for BMW 335i
1. Tomioka Racing (TR) Twin Turbo Upgrade
The TR kit replaces stock N54 turbos with TD04-based units ranging from 15T to 19T—supporting between 720 and 830 hp. It includes stainless steel housings, billet compressor wheels, comprehensive oil lines, and bolt-on ease for N54 cars.
| Feature | Description |
|---|---|
| Turbo Sizes | 15T (≈720 hp) • 16T (≈780 hp) • 19T (≈830 hp) |
| Build Quality | Stainless steel, billet internals, new manifolds & oil lines |
| Best For | High-horsepower bolt-on twin setup |
2. DOC Race + Precision Single Turbo Kit
This top-mount kit uses Precision turbos (from 5862 to 6870), pushing 640–1,100 hp. It includes a T4 manifold, wastegates, and polished components—ideal for street or race build versatility.
| Feature | Description |
|---|---|
| Power Capability | 640–1,100 hp (user’s turbo choice) |
| Setup | Street-suitable single turbo with necessary hardware |
| Best For | Ultimate power seekers with space and tuning support |
3. CTS Turbo Stage 2 Twin Turbo Kit
CTS Stage 2 swaps stock turbos with upgraded TD04-based twins, delivering around 550–600 hp. The bolt-on kit includes stainless manifold, billet upgrades, and no core charge.
| Feature | Description |
|---|---|
| Output | ≈550–600 hp |
| Equipment | TD04 billet compressor, stainless steel manifold |
| Best For | Street builds wanting steady mid-power boost |
4. RB (Rob’s Billet) High‑Flow Twin Turbos
RB twin turbo systems are highly regarded for their machining quality, versatility, and community support. Installers often note excellent craftsmanship and Rob’s hands‑on customer care.
“I recommend RB turbos. Rob is a great guy and makes badass turbos… probably the highest quality twins you can buy.”
5. Pure Stage 2 Twin Turbos
Pure Stage 2 turbos remain a trusted choice, often delivering reliable 650 hp street builds. Around forums and dyno videos they’ve built a reputation as solid, well-rounded performers.
6. Other Twin Options: Hydra, FrankenTurbo
Brands like Hydra HP650/800 and FrankenTurbo F‑Series appear across modern BMW forums. RB and Hydra often lead recommendations, while lesser-known brands see mixed feedback.
Choosing: Stock, Twin, or Single Turbo?
- Twin turbo kits (TR, CTS, RB) preserve stock layout, offer smooth spool, and great response.
- Single-turbo conversions (Precision kits) provide massive top-end power and simplicity, though they can lag and require extensive support mods.
- Choose based on horsepower goal, daily use, and what plumbing and tuning infrastructure you’re comfortable installing.
Community Feedback
Enthusiast forums favor RB and TR twins, with strong interest in Precision single conversions for max power:
“I run an upgraded twin setup. But a single turbo is better for daily because it avoids rocket-launch lurching at stoplights.”
Supporting Modifications & Installation Tips
- Tuning: Essential—either JB4 piggyback or full ECU flash required.
- Fuel & cooling: Injectors, pumps, intercooler upgrades, and oil cooler mandatory above 600 hp.
- Engine internals: Forged rods/pistons, head studs, and port injection help handle big power.
- Exhaust & intake: 3″ downpipes, charge pipes, wastegates, BOVs, and heat shielding improve performance and reliability.
- Monitoring: Install wideband AFR, boost, intake temperature, and knock sensors.
Which Kit Is Right for You?
| Goal | Recommended Kit | Power Range | Pros | Cons |
|---|---|---|---|---|
| High-reliability twin setup | Tomioka Racing TR Twin | 720–830 hp | Bolt-on, premium stainless | Expensive, big footprint |
| Maximum single turbo power | DOC Race + Precision | 640–1,100 hp | Simple, massive power headroom | Lag, complex plumbing |
| Daily street with moderate power | CTS Stage 2 Twin | 550–600 hp | Smooth spool, no core charge | Limited to ~600 hp |
| High-quality twin build | RB High-Flow Twins | Varies by config | Exceptional build quality | Custom support required |
| Proven street performer | Pure Stage 2 Twins | ≈650 hp | Time-tested, reliable | Not as modern or refined |
Conclusion & Next Steps
BMW 335i turbo tuning remains a favourite among enthusiasts—and with good reason. Whether you want a smooth bolt-on twin or a fire-breathing single turbo, there’s a kit suited to your vision.
Next Steps:
- Clarify your horsepower target.
- Choose between twin or single layout.
- Plan supporting mods: tune, fuel, cooling, intake/exhaust.
- Order your kit, install professionally, tune safely, and monitor closely.
Have questions on fuel setups, turbo sizing, or choosing a tune? I’d love to help you build your perfect 335i.