A recent dyno test revealed the Z4 M40i likely has more power than advertised, but that won’t stop people from complaining about BMW’s decision to rule out a full-fat Z4 M. For those hard to please, there’s always the aftermarket scene to count on should you want the inline-six to pump out higher horsepower and torque numbers.

When it leaves the assembly line at Magna Steyr’s factory in Graz, Austria, the BMW Z4 M40i with its 3.0-liter engine offers an already healthy 382 horsepower and 369 pound-feet (500 Newton-meters) of torque. If that doesn’t quench your thirst for power, you’ll be happy to hear Swiss tuner Dähler has a stage 1 kit that unlocks 402 hp and 457 lb-ft (620 Nm) while getting rid of the top speed limiter. Stage 2 lifts the output numbers furthermore to 435 hp and 472 lb-ft (640 Nm).

Gallery: BMW Z4 M40i by Dähler

Unfortunately, the tuner doesn’t say anything about how the power gains have boosted performance, but surely this BMW Z4 tricked out by Dähler will eclipse the standard car’s 4.4-second sprint to 60 mph (96 kph). It likely reaches a top speed higher than the electronically governed 155 mph (250 kph) just about all German performance cars are fitted with as standard.

To send out that Z4 M vibe, the sporty roadster has gained the signature M circular quad exhausts replacing the pair of angular finishers of the warm M Performance version. A spoiler lip has been added at the front bumper for extra effect, while the stock wheels have been swapped out for a larger 21-inch set of the tuner’s own alloys and wrapped in skinny Michelin tires.

Rounding off the changes are the suspension lowering springs bringing the droptop closer to the road. Alternatively, customers can go for a coilover suspension adjustable in height and hardness. Future upgrades planned by Dähler include a plug and play module “for an additional increase in agility,” a glass wind deflector, and a more sophisticated coilover suspension.

Source: Dähler

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Z4 (G29) M40i «dÄHLer competition line»: the sporty and precise driving fun!

The eagerly yearned new Z4 Roadster is finally here and now earns the predicate "sporty". And after the performance and optimization treatment by Dähler, the predicate "sports car" is well deserved, too. The new roadster, which has been comprehensively redesigned and improved by Dähler Competition Line AG from Belp near Bern in Switzerland, is now available as a Z4 M40i "DÄHLer competition line" in order to hop in and drive off!

Roadster rides are a true pleasure – no matter with the roof open or closed. A fascination of a very special kind and the continuation of a long tradition. The Z4 M40i "DÄHLer competition line" is not just an eye-catcher, but an extensively optimized curve chaser.

Dähler provided an additional performance cure to the factory-installed engine - in the series: 250 kW (340 hp), 500 Nm (lb-ft 369) - and extracted everything out of the engine, and the entire vehicle, whatever furnishes sense and most fun.

Performance data and features of the Z4 (G29) M40i «DÄHLer competition line»:

  • Power increase level 1 «powered by dÄHLER»: 300 kW (408 hp), 620 Nm (lb-ft 457), incl. removal of the standard V/max limitation, WLTP-tested and EU-/CH-homologated.
  • Power increase level 2 «powered by dÄHLer»: 324 kW (440 hp), 640 Nm (lb-ft 472), including the removal of the standard V/max limitation.
  • Stainless steel exhaust system «built by dÄHLer» (rear silencer with 4 tailpipes) with the sporty-sonorous and unmistakable DÄHLER-typical sound.
  • Competition coil-over «built by dÄHLer» (adjustable in height and hardness)or lowering with a harmonious sports spring set «built by dÄHLer».
  • Ultralight 20- or 21-inch forged wheel «dÄHLer CDC1 FORGED» with Michelin tires - the sporty and elegant wheel developed and manufactured in-house.
  • 20 or 21-inch aluminum wheel « dÄHLer CDC1» with Michelin tires - the sporty and elegant wheel developed and manufactured in-house.
  • Front spoiler lip «built by DÄHLer».

Coming soon:

  • Competitive clubsport coil-over kit "built by dÄHLer" (adjustable in height and hardness for low and high speed rides) and the DDC Plug and Play for an additional increase in agility.
  • DÄHLer glass wind deflector made of 5 mm tempered safety glass (ESG), with DIN stamp and TÜV approval certificate, (for vehicles with standard wind deflector) - available soon.
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