CBB58-0401 – 2021+ B58 Stage 1 SW, (M240i, M340i, M440i & Z4 M40i)

Part Number: CBB58-0401 Category:



Note: *This can ONLY be installed at an Authorized CarBahn dealer.
Click here to find your local dealer.

⚠️ Special Instructions: The DME(s) need to be pulled out of the engine bay and shipped to Europe for unlock before flashing can be done at the dealer. The cost to unlock the DME and retain the remote start feature (if equipped) is an additional $1,175.00

Stock – 93 Octane 
Stock Wheel HP & TQ: 345 WHP & 380 lb-ft WTQ 
Stock Flywheel HP & TQ: 420 HP & 463 lb-ft TQ 

Tuned – 93 Octane 
Tuned Wheel HP & TQ: 391 WHP & 423 lb-ft WTQ 
Tuned Flywheel HP & TQ: 477 HP & 516 lb-ft TQ 
Delta Wheel HP & TQ: 46 WHP 43 lb-ft WTQ 
Delta Flywheel HP & TQ: 57 HP & 52 lb-ft TQ 


  • *This can only be installed at an authorized CarBahn dealer! 
  • Top speed governor removed 
  • CarBahn EVO Intelligent software adapts to various fuel octane levels seamlessly, optimizing performance without compromising safety. It retains existing safety features and adds extra protection as needed

Additional Information


CarBahn’s EVO intelligent software possesses remarkable adaptability to a large range of fuel octanes. Through our software, we employ retuning techniques while ensuring that all critical safety features, which are often neglected, remain intact and add additional safety features where necessary. To gain a deeper understanding of these safety limits, we invite you to watch the informative video available at this link. By recalibrating the safety limits, our software seamlessly adapts from 93 to 100 octane, eliminating the necessity for a customized tune when employing race gas. This unique functionality enables the software to deliver maximum power with each octane variant without compromise. Consequently, there is no need to purchase a custom tune exclusively for race gas usage. Our software is meticulously designed to provide the highest achievable performance output while upholding safety as a paramount concern. Here, the term “intelligent software” denotes the accurate and optimized tuning of the software, avoiding excessive tuning. Our objective is to craft a torque curve that maintains a natural and harmonious delivery, as showcased in this link. We avoid generating excessive torque at low RPMs, which could result in tire slippage, engine stress, and drivetrain failures. By managing torque with a smooth delivery, our software enhances drivability, thereby fostering increased speed and reliability. In contrast to our competitors, who often attempt to maximize performance by pushing boost levels beyond safe limits, our approach prioritizes reliability. We refrain from compromising knock sensitivity and thermal protections, which are vital for safeguarding the engine from potential damage caused by extreme power extraction.



Unlike most tunes available in the market, CarBahn’s software maintains the integrity of safety parameters, preserving them to prevent any compromise in engine performance and longevity. Parameters such as knock control sensitivity, super knocking control sensitivity, and catalyst thermal protection are carefully tuned within your OEM software to mitigate the risk of engine and catalyst failure. In our pursuit of optimizing power delivery, we have minimized power losses to a mere 12 HP when reducing these supposed power-reducing software protections. On the contrary, we have witnessed numerous instances of damaged engines resulting from the reduction of these safety parameters. Thus, it becomes apparent that gaining a marginal 12 HP advantage hardly justifies the potential risk of significant engine damage.


Do-it-yourself Approach:

It is essential to acknowledge the emergence of self-tuning tools in the automotive market. While these tools offer the convenience of tuning your vehicle independently, it is crucial to exercise caution. Many of these tools come equipped with pre-set programs that conveniently bypass safety limits, thus posing a substantial risk of engine damage. The art of tuning a high-output engine requires profound knowledge and experience to extract maximum power without compromising the engine’s structural integrity.


Emissions Legality:

Let us address the topic of removing the catalyst, commonly achieved through the utilization of downpipes. Our rigorous testing regimen involved conducting consecutive dyno runs with and without the catalyst, and the observed power gain was significantly smaller than commonly touted, typically around 11 HP. Nevertheless, it is important to acknowledge our shared responsibility towards environmental preservation, as clean air is vital to our well-being. Furthermore, obtaining the necessary emissions certifications without a catalyst is a daunting task and, from a legal standpoint, it is considered an infringement.


About Steve Dinan:

With an illustrious career spanning over four decades, Steve Dinan stands as an authority in streetcar turbo tuning. Under his leadership, our team has triumphed in three prototype racing championships and secured two overall victories at the esteemed 24 Hours of Daytona in collaboration with Chip Ganassi Racing. Steve Dinan’s unparalleled expertise solidifies our claim as the leading force in tuning high-performance engines.


Warranty Information:

Click here for all queries related to CarBahn Warranty.



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