Skip advert
Advertisement

BMW Z4 M40i pumped up to 394bhp by AC Schnitzer

Not only has AC Schnitzer tuned the Supra, it’s also turned its handed to the range-topping BMW Z4 

Following on from its take on the B58-equipped Toyota Supra, German tuner AC Schnitzer has worked its magic on the G29 BMW Z4 M40i - while also announcing upgrades for lesser 4cyl variants. Additions to the M40i include a healthy bump in power, upgraded interior components, changes to the exterior trim and more. 

Advertisement - Article continues below

As with the fettled Supra, AC Schnitzer has taken the 3.0-litre, turbocharged B58 straight-six from its factory 335bhp, 369lb ft figures, to a very respectable 394bhp and 442lb ft of torque. This represents increases of 59bhp and 73lb ft over stock and, for reference, the new numbers put the Z4 Schnitzer just ahead of the standard BMW M2. Performance after the bump in power is yet to be measured, but a 0-62mph sprint of under the 4.6sec stock time is to be expected. Power upgrade kits for the 4cyl 30i and 20i models are also in the pipeline. 

> AC Schnitzer reveals styling and power upgrades for Toyota GR Supra

Elsewhere, the BMW drop-top receives a new AC Schnitzer engine cover, an upgraded quad-tip exhaust system, a more aggressive front splitter, two-piece spoiler, side skirts and of course, AC Schnitzer branding throughout. Aiding performance are carbonfibre bonnet vents for increased cooling, a choice of lightweight, 20” forged wheels wrapped in 255 front, 275 rear rubber, and adjustable coilover suspension, lowering ride height by 25mm in the 40i. 

Inside, owners are also treated to a host of uprated aluminium components, ranging from a new set of shift paddles behind the steering wheel to higher quality pedals. 

A standard Z4 M40i will cost you from £49,050, however pricing for the upgrades hasn’t been announced. Should the prospect of tuning a brand new BMW concern you, fear not, as a 5-year warranty comes with any work carried out by AC Schnitzer.

Skip advert
Advertisement

Recommended

BMW's Z4 lives on as the Bovensiepen Spider – just don’t call it an Alpina
Bovensiepen Spider
News

BMW's Z4 lives on as the Bovensiepen Spider – just don’t call it an Alpina

Bovensiepen, the company born out of the ashes of Alpina, has reimagined the BMW Z4 with the help of the McLaren P1’s designer
11 Sep 2026
BMW Z4 Handschalter (2024 - 2026) review – a true Porsche Boxster rival?
BMW Z4 Handschalter
Reviews

BMW Z4 Handschalter (2024 - 2026) review – a true Porsche Boxster rival?

BMW added involvement and driver appeal to the Z4 with the Handschalter, but it’s still a better GT than it is a sports car
14 Aug 2026
How four months in the BMW Z4 Handschalter revealed the Toyota Supra's weakness
evo Fast Fleet BMW Z4 Handschalter
Long term tests

How four months in the BMW Z4 Handschalter revealed the Toyota Supra's weakness

With its manual ’box and retuned chassis, the Handschalter succeeded in exceeding expectations
7 Aug 2026
The BMW Z4 Final Edition is the very last of its kind
BMW Z4 Final Edition
News

The BMW Z4 Final Edition is the very last of its kind

Production of the third-generation BMW Z4 is coming to a close, and this is the final version you’ll be able to buy
26 Nov 2025
Skip advert
Advertisement

Most Popular

De Tomaso Pantera (1971-1992) review – the forgotten 1980s supercar
De Tomaso Pantera
Reviews

De Tomaso Pantera (1971-1992) review – the forgotten 1980s supercar

The Pantera is an oft-forgotten, much-misunderstood supercar. Driving the rare GT5-S version shows it deserves its place among the greats
15 Sep 2026
BMW M5 (F90, 2017 - 2023) review – a 600bhp saloon for £35k
BMW M5 Competition F90
In-depth reviews

BMW M5 (F90, 2017 - 2023) review – a 600bhp saloon for £35k

The F90 BMW M5 added polish and all-wheel drive to Munich’s super saloon formula, making it quicker than even its 2026 successor
15 Sep 2026
Volkswagen ID.3 GTI revealed as the most powerful GTI ever
Volkswagen ID.3 GTI
News

Volkswagen ID.3 GTI revealed as the most powerful GTI ever

Following behind the new ID.Polo GTI, Volkswagen has applied the GTI formula to its all-electric ID.3 to make it the most powerful GTI yet
16 Sep 2026