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 Z4 Handschalter 2025 review – manual improves Munich's Boxster rival
BMW Z4 Handschalter
Reviews

BMW Z4 Handschalter 2025 review – manual improves Munich's Boxster rival

BMW has added involvement and driver appeal to the Z4 with the Handschalter, but it’s still a better GT than it is a sports car
20 Mar 2025
BMW Z4 review – Munich's endearing roadster is no Boxster killer
BMW Z4 M40i
In-depth reviews

BMW Z4 review – Munich's endearing roadster is no Boxster killer

Less dynamic than its Stuttgart rival, but still a rewarding and practical everyday machine
14 Feb 2025
BMW Z4 M40i Handschalter v Toyota Supra – manual sixes go head-to-head
BMW Z4 M40i Handschalter and Toyota Supra
Group tests

BMW Z4 M40i Handschalter v Toyota Supra – manual sixes go head-to-head

Can the addition of a manual gearbox and a raft of chassis mods transform BMW’s Z4? And does it have the measure of its manual Toyota Supra cousin?
2 Nov 2024
Skip advert
Advertisement

Most Popular

Mercedes-AMG GT 43 2025 review – £100k four-cylinder lacks Affalterbach soul
Mercedes-AMG GT 43
Reviews

Mercedes-AMG GT 43 2025 review – £100k four-cylinder lacks Affalterbach soul

Affalterbach’s flagship GT range now begins with a four-cylinder, lifted straight from the A45 hot hatch. It might have reasonable performance on tap,…
15 Sep 2025
Audi R8 V8 (2007 - 2015) review – the Porsche 911’s equal is a bargain super sports car
Audi R8 V8
Reviews

Audi R8 V8 (2007 - 2015) review – the Porsche 911’s equal is a bargain super sports car

The Audi R8’s launch was perhaps one of the biggest moments in 2000s performance motoring. It’s as sweet today as back then
9 Sep 2025
Mini Cooper and Cooper S (2001 - 2006) review – the 'new' Mini is now a classic
Mini Cooper S
Reviews

Mini Cooper and Cooper S (2001 - 2006) review – the 'new' Mini is now a classic

The ‘new’ Mini was perhaps motoring’s most anticipated sequel. BMW didn’t get it wrong – quite the opposite, as it transpired
11 Sep 2025