CBG8X-9005 – EVO Smooth Power-Package Stage 1 for BMW G8x M3 and M4 Base Manual RWD 2021+

Part Number: CBG8X-9005 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 $1,375.00

Comp RWD

Stock – 93 Octane

Stock Wheel HP & TQ: 465 WHP & 419 lb-ft WTQ
Stock Flywheel HP & TQ: 528 HP & 476 lb-ft TQ

Tuned – 93 Octane

Tuned Wheel HP & TQ: 582 WHP & 530 lb-ft WTQ
Tuned Flywheel HP & TQ: 661 HP & 602 lb-ft TQ
Delta Wheel HP & TQ: 117 WHP 111 lb-ft WTQ
Delta Flywheel HP & TQ: 133 HP & 126 lb-ft TQ

Tuned – 100 Octane

Tuned Wheel HP & TQ: 594 WHP & 533 lb-ft WTQ
Tuned Flywheel HP & TQ: 675 HP & 696 lb-ft TQ
Delta Wheel HP & TQ: 129 WHP 114 lb-ft WTQ
Delta Flywheel HP & TQ: 147 HP & 130 lb-ft TQ


  • *This can ONLY be installed at an Authorized CarBahn dealer!
  • St 1 Power package includes ST2 software, Heat Exchanger, CarBahn HP air filters
  • Fits Automatic Transmission equipped models only!
  • 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.
  • This software was developed with our heat exchanger installed to achieve the claimed power output and it is required for our matching factory warranty!

Additional Information

The Stage 1 Power package is safe and powerful. Combining the latest heat exchanger and software technology. CarBahn’s Heat exchanger increases OEM heat exchanger capacity by 40%! This heat exchanger uses F1 heat exchanger technology. This makes our heat exchanger dramatically more efficient than the lower cost heat exchangers on the market. The race car heat exchanger is also very light. Combined with CarBahn ST2 software provides large increase in power safely. Please watch the video in this link for more 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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