CBB58-0101 – Smooth Power Flash Stage 1 software for M340i (G20), Z4 M40i (G29), 540i (G30), 740i (G11/G12) & 840i (G14/G15/G16)

Part Number: CBB58-0101 Category:
(2 customer reviews)



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

Calculated Flywheel Power:

OEM Stock:  420HP / 463TQ
Tuned 93 Octane:    477HP / 516TQ

Measured Wheel Power:

OEM Stock   345WHP / 380WTQ
Tuned 93 Octane:   391WHP / 423WTQ

  • Stage 1 software $750
  • Matching warranty Option $1000
  • Exhaust overrun option – $100.00



Additional Information

CBB58-0101 – Smooth Power Flash Stage 1 software for M340i (G20), Z4 M40i (G29), 540i (G30), 740i (G11/G12) & 840i (G14/G15/G16)


CarBahn software is designed to deliver the highest safe output possible. Smooth Power means software tuned correctly, not over-tuned. We always try to make a natural torque curve, not excessive torque at low RPM that falls off rapidly at high RPM. Excessive torque will break the tires loose, break the engine and drivetrain. Managed torque with a smooth delivery makes the car easier to drive thereby faster and more reliable. Most if not all our competitor tunes attempt to run too much boost, resulting in active knock corrections which causes surging during acceleration. CarBahn software also incorporates torque reduction in 1st and 2nd gears for manageable power delivery.


Most if not all tunes on the market except CarBahn reduce safety parameters in the software in an attempt to extract more power. These safety parameters such as knock control sensitivity, super knocking control sensitivity, and catalyst thermal protection are tuned into your OEM software to prevent engine and catalyst failure. When we reduced all the supposed power robbing software protections we lost less than 8 HP and 8 LB/FT Torque. We have seen many damaged engines as result of reducing these safety parameters! It hardly seems worth it for 8HP.

Doing it yourself:

A note on self-tuning tools. There are now programs available that you can buy to tune your car yourself. Many of these tools come with canned programs. Be careful as tuning a high output engine requires tremendous knowledge and experience to extract maximum power without damage.

Emissions legality:

A note on down pipes (removing the catalyst). We have run back to back dyno runs with the cat on and off and the power gain is much smaller than most people claim. We all need to breathe the air. Its difficult to get your car its required emissions test without catalyst and it’s illegal.

High boost with stock engine:

We have seen many damaged engines as result of making too much power with a stock engine. While modern engines are very reliable, it is easy to add large turbochargers and water methanol injection and break the engine. On the F8X, maximum safe power on a stock engine is 600 LB/FT flywheel torque. CarBahn makes high performance engines designed to handle more power. More information is available on this web site.

About Steve Dinan:

Steve Dinan has over 40 years of street car turbo experience. As an engine supplier we won 3 prototype racing championships and two overall wins at the 24hrs of Daytona partnering with Chip Ganassi Racing. No one know more about tuning high performance engines than Steve Dinan.

Warranty Information:

*Registration with CarBahn Autoworks at time of purchase is required in order to maintain matching warranty coverage. CarBahn Autoworks reserves the right to deny warranty program enrollment under certain conditions. Please contact us prior to purchase if you have any questions.

*Warranty valid on U.S. and Canadian specification vehicles only.If your vehicle is currently covered by the vehicle manufacturer new car limited warranty, CarBahn Autoworks’ products are warranted for the remaining term of the vehicle manufacturer new car limited warranty. The manufacturer new car warranty is limited to 4 years or 50,000 miles (80,000 kilometers in Canada), commencing on the date of first retail sale or the date the vehicle is first placed in-service as a demonstrator or company vehicle, whichever is earlier. CarBahn Autoworks’ warranties are transferable when ownership of the vehicle into which the CarBahn Autoworks products were originally installed is sold.The warranty will, without charge for parts or labor, repair or replace the defective CarBahn Autoworks’ component(s), as well as any original vehicle manufacturer component(s) that may have been directly affected by a CarBahn Autoworks component, using new or authorized remanufactured parts. The decision to repair or replace said parts is at the sole discretion of CarBahn Autoworks. Parts for which replacements are supplied under this limited warranty become the property of CarBahn Autoworks. In all cases, a reasonable period of time must be allowed for warranty repairs to be completed.

If your vehicle is outside of the vehicle manufacturer’s new car limited warranty, for two (2) years from the original purchase date of the CarBahn Autoworks product, CarBahn Autoworks will repair or replace, at its sole discretion, any defective CarBahn Autoworks component. This warranty does not include reimbursement for repairs to any original vehicle manufacturer component(s) that may have been affected by a CarBahn Autoworks component.

*Warranty exclusions:

Return shipping charges, towing charges, rental car fees damage to a component or assembly due to the installation of replacement parts with specifications that differ in any material respect from the original vehicle manufacturer or CarBahn Autoworks parts, damage resulting from the unauthorized modification of a CarBahn Autoworks part or assembly, damage resulting from the use of other manufacturer products in conjunction with CarBahn Autoworks’ products or systems, damage to the clutch due to power shifting or abuse, brake rotor warp, friction materials, maintenance services and parts when replaced during maintenance such as spark plugs, lubricants, fluids, engine tune-up parts, replacement of filters, coolant and refrigerant, mechanical adjustments or repairs which result from normal wear and tear, drive-belts, light bulbs, damage due to the failure to perform maintenance services at the specified intervals or in accordance with the instructions in the owner manual from the original vehicle manufacturer or CarBahn Autoworks’ product instructions, damage attributable to negligence or abuse, improper installation, improper treatment or treatment contrary to the instructions in the owner manual from the original vehicle manufacturer or CarBahn Autoworks’ product instructions, engine damage resulting from alteration of CarBahn Autoworks’ original boost pressure, damage resulting from the use of improper or contaminated fuel, damage occurring through corrosion resulting from weak or improper coolant, damage to a CarBahn Autoworks component as a result of a collision or improper collision damage repairs, any vehicle operated in any competitive event or subjected to aggressive track conditions, custom-designed competition parts, damages resulting from loss of time, inconvenience or loss of the use of the vehicle, damage resulting from environmental influences, flood, accident, fire damage, or road salt corrosion, re-manufactured or refurbished products or components (these products are clearly identified as re-furbished and are warranted for the period specified for that particular product).


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2 reviews for CBB58-0101 - Smooth Power Flash Stage 1 software for M340i (G20), Z4 M40i (G29), 540i (G30), 740i (G11/G12) & 840i (G14/G15/G16)

  1. Sam King

    The M340i is no slouch to begin with, but this tune just turns it into a different beast. The increase in power is immediately noticeable in every gear, throughout the entire RPM range. The warranty coverage helps with peace of mind as well; the main reason why I went with CarBahn. I was on the fence about getting the G20 M3 because of the wait and the cost, but this tune has put me solidly in the M340i camp because of the cost-to-power ratio. Totally satisfied.

  2. Chris G.

    Absolutely incredible difference! I have the 2020 BMW M340xi, I had a Camaro SS before that. I was noticing that the stock car was definitely slower than my camaro off the line and down the stretch. After this software update that I did at the dealership, everything is different. I would say it’s pulling low 3’s on 0-60 and the removal of the governor is huge as well if you like to go fast. I dropped my car off on the 14th, picked it up the 15th. I was told if this was during the COVID-19 times that it would’ve been done same day. Worth every penny, get the warranty, that way if anything happens, no one can blame this on the engine problems and not cover you. Eagerly will be watching the site to look for more stages and will probably continue to progress my car. With this update, you’d be really close to being able to take a stock M5 off the line! It’s also got a nice little pop and growl to it in sport mode now that I love and I am still rocking stock exhaust.

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