Unlock the full tuning potential of your B58 engine with proven upgrades from 117 Speed.
The BMW B58 engine delivers incredible power even in stock form, but to make the most of your ECU remap, the right hardware upgrades are essential.
At 117 Speed in Manchester, we’ve tuned hundreds of B58-powered cars, including the BMW M140i, M340i, Toyota Supra, and Z4. We know which supporting mods deliver real-world results and which ones don’t.
This guide covers the best B58 upgrades for Stage 1, Stage 2, and Stage 3 tuning, helping you plan your build safely and effectively.
Looking to tune your B58-powered BMW or Supra?
A high-flow or decat downpipe is one of the most effective hardware upgrades for the B58. It reduces exhaust backpressure, allowing the turbo to spool faster and run more efficiently, typically adding 20–30 bhp when combined with tuning.
Benefits:
Faster turbo response
Deeper, sportier sound
Essential for Stage 2 tuning and above
Recommendation:
Use a premium stainless or Inconel downpipe with a 200-cell sports cat or decat (track use only).
The stock intercooler performs well up to Stage 1, but higher boost levels create more heat.
An upgraded intercooler keeps intake temperatures stable during extended acceleration or track sessions, ensuring consistent power delivery.
Benefits:
Reduces heat soak
Maintains air density for stronger mid-range torque
Supports Stage 2 and Stage 3 builds
A performance intake increases airflow and sharpens throttle response while adding a satisfying turbo sound.
Although gains are modest (around 5–10 bhp), they help the turbo breathe more efficiently at higher boost pressures.
Options:
Open cone filters for maximum flow and sound
Enclosed carbon systems for cooler intake air
Best suited for Stage 2+ builds or anyone seeking more response and induction noise.
A performance exhaust system complements tuning and downpipe upgrades by improving exhaust flow and sound.
Benefits:
Freer flow for smoother top-end power
Deeper, more aggressive exhaust tone
Available in valved or non-valved designs
| Note | Cars with OPF/GPF filters may require ECU calibration when removed or modified. |
|---|
For serious power, hybrid and full-frame turbo upgrades can take the B58 beyond 500 bhp.
Options:
| Stage 3 hybrid turbo | upgraded internals in the stock housing |
|---|---|
| Big turbo | full replacement for maximum airflow and response |
These setups require upgraded fuelling, cooling, and gearbox tuning for reliability.
To support hybrid turbos or ethanol tuning (E30–E85), B58 fueling hardware should be upgraded.
Options:
| TU HPFP (High-Pressure Fuel Pump) | supports up to 550 bhp |
|---|---|
| Port injection or methanol | for 600+ bhp builds |
| Flex-fuel tuning (Bootmod3 or MHD) | safely blends petrol and ethanol for cooler combustion and more power |
Higher power levels increase thermal load and stress. Supporting mods help keep your build consistent and reliable:
Oil coolers for track use
Upgraded charge pipes to replace factory plastic
High-performance spark plugs and coils for strong ignition under boost
Power is only one part of performance. Chassis and drivetrain upgrades complete the package:
| LSD (limited-slip differential) | improves traction and control |
|---|---|
| Performance coilovers | sharper response and balanced handling |
| Big brake kits | essential for track or high-power builds |
Book your car in or ask us anything — we’ll recommend the right stage and get you a date.
| Build Type | Power (bhp) | Key Upgrades |
|---|---|---|
| Stage 1 Daily | 380–400 | ECU remap only |
| Stage 2 Daily | 420–460 | Downpipe, intercooler, intake |
| Stage 2+ Track | 480–500 | Add TU HPFP + gearbox tune |
| Stage 3 Performance | 550–700+ | Hybrid turbo, fueling, cooling |
Speak to a BMW & Supra tuning expert, or explore our stage 1–3 remap packages
Tell us your car and what you want from it — we’ll recommend the right stage and get you booked in.
