Some engines enter the tuning world quietly.
The BMW B58 did not.

Since its launch in 2015, the B58 has risen from “the next BMW straight-six” to one of the most dominant turbo platforms of the modern era — a closed-deck, water-to-air-intercooled, boost-hungry masterpiece now responsible for record-shattering drag cars, monstrous street builds, and an entire global tuning movement.

Whether found under the bonnet of a BMW M340i or the heart of a Toyota Supra, the B58 has earned its status as a future classic, a modern 2JZ, and one of the most punishable yet refined production engines ever built.

And in the UK, there’s one name that keeps showing up behind the fastest, hardest-charging B58 builds: Walton Motorsport — the British fabricators who build the manifolds this engine deserves.

Let’s dig into the engine, the history, the tech, the power potential, and the records the B58 continues to smash.

Where the B58 Started: BMW’s New-Age Inline Six

The B58 was designed by BMW’s Powertrain Engineering division as part of the “B-series” modular family (B38 → B48 → B58), each sharing a 500cc-per-cylinder architecture.

Its design goals were simple:

Better thermal efficiency
Higher torque
Lower emissions
Improved reliability
A stronger block with higher boost capability
A platform that could scale for future high-output models

BMW didn’t just meet those goals.
They accidentally created one of the greatest tuner engines of the 21st century.

First Production Car to Receive the B58

The engine made its debut in:

BMW F30 340i (2015)

Immediately it overshadowed the outgoing N55 — smoother, stronger, more responsive, and much more durable. But no one yet realised how far above its weight class the B58 could punch.

Engineering Breakdown — Why the B58 Is So Strong

The B58 is a showcase of modern engine design, but with the robustness tuners crave.

Core Features

Closed-deck aluminium block (huge jump in strength over N55)
Forged steel crankshaft
Integrated water-to-air intercooler inside the intake manifold
350 bar high-pressure direct injection
Electronic wastegate twin-scroll turbo
Double VANOS + Valvetronic
Exceptionally rigid block & crankcase structure

Factory Specs

Displacement:

2998 cc (3.0L)

Bore x Stroke:

82.0 mm × 94.6 mm

Compression Ratios:

11.0:1 (B58B30M0, B58B30O0)
10.2:1 (B58TU1)

Factory Power:

Early models: 322–335 hp
B58 TU1: 382 hp (and frequently dynos higher)

Factory Turbo System:

Single, twin-scroll turbocharger
BorgWarner or Continental depending on the year

B58 Drag Racing Dominance

Here's where the legend took off.

The B58 became the backbone of some of the world’s quickest street-based turbo cars:

🔥 6-second B58 drag cars (full-frame turbo, built engine)
🔥 7-second Supras becoming increasingly common
🔥 8-second “street cars” on real fuel and full interiors
🔥 900–1200hp builds rapidly becoming normal
🔥 Stock-bottom-end B58s holding 600–700whp reliably

It’s rare to see a modern mass-produced engine tolerate power increases like this.
With the right turbo system and manifold, the B58 becomes a genuinely brutal drag platform while remaining smooth and refined on the street.

This explosive growth in performance is exactly why Walton Motorsport stepped in with purpose-built B58 manifolds — engineered in Britain for the global B58 community pushing harder and faster every year.

Which Cars Received the B58 Engine?

The B58 appears across BMW’s most popular models:

3 Series

F30 340i
G20 M340i

4 Series

F32 440i
G22 M440i

5 Series

G30 540i

7 Series

740i

X Series

X3 M40i
X4 M40i
X5 40i
X6 40i

Toyota Supra (A90/A91)

Shared BMW–Toyota implementation
The moment Supra tuners got their hands on it… the B58’s legend exploded.

Predecessor vs Successor

Predecessor: BMW N55

A solid engine, but weaker:

Semi-open deck
External intercooler
Lower high-boost tolerance

The B58 eclipsed it instantly.

Successor: None (as of 2025)

The B58TU1 remains BMW’s flagship straight-six, with no confirmed successor.

If this is the last non-hybrid inline six from BMW… they left on a high note.

What Makes Walton Manifolds the Choice for High-Power B58 Builds

🔶 100% British-made turbo manifolds
Hand-fabricated with precision and accountability.

🔶 Walton’s proprietary cast stainless collector
CFD-developed for unmatched gas flow, temperature control and strength.

🔶 Perfect wastegate priority for high boost stability
A critical factor in 800–1200hp B58 builds.

🔶 Thick-wall 304 stainless runners
Engineered for repeated thermal expansion cycles at drag-racing temperatures.

🔶 A Lifetime Warranty
Because real engineering doesn’t need fine print.

From street builds to world-record drag Supras, Walton manifolds have proven themselves again and again — putting British engineering at the centre of the global B58 tuning scene.

Want to know more?

BMW B58 Type A Lowe Mount Turbo Manifold by Walton Motorsport HERE

BMW B58 Type B - High Mount Turbo Manifold by Walton Motorsport HERE

The BMW B58: The Modern Boost Icon