Dinan Stage 2 Performance Engine Software - BMW 'F' Chassis N55 Engine (Non-M2 / X4 M40i)

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Part # D900-N55-S2 Be the first to write a review

Dinan Stage 2 Performance Engine Software - BMW 'F' Chassis N55 Engine (Non-M2 / X4 M40i)



This part is legal under the provisions of EPA’s Tampering Policy dated November 23rd, 2020.

See Emissions Details
Stage 1 have you wanting more? Stage 2 Dinan performance engine tuning for 'F' chassis N55 platforms provides a new found level of exhilaration and enjoyment for you to enjoy. Taking advantage of supporting hardware (Dinan big turbo and an upgraded intercooler), the stage 2 engine calibration takes a significant step up in performance. Yielding nearly 40 WHP / 60 lb-ft of torque more on pump gas over stage 1 (over 70 WHP / 80 lb-ft of torque on race gas) the bump in power equates to a transformation akin to purchasing a completely different vehicle. While increases in power to this scale typically come at a cost to the engine's durability, this is typically due to improper calibrations that are simply after one goal regardless of engine health - maximum power. Dinan's stage 2 mappings when used in conjunction with supporting hardware are safe and reliable without sacrificing long-term reliability or performance. Dinan performance engine software is so much more than just turning up the turbo boost after all. It is a fully re-tuned engine management program that maximizes power while keeping all the BMW factory safeguards in place. In most cases Dinan software engineers also implement their own additional safety precautions in order to guarantee flawless performance that may not have been needed with factory power levels/programming. Protecting your BMW, while giving the most performance, is the definition of "Performance Without Sacrifice". To do just that, drivetrain and engine components are analyzed for strength, and then the calibration is tested on the dyno and in the real world for durability and drivability. This process has been a cornerstone of Dinan software development for decades and a major reason why Dinan performance tunes are often labelled as being the smoothest, factory-like solution in the marketplace. With factory-like reliability/safety and staggering performance, it's hard to find a reason not to upgrade to stage 2. That "new car" you always wanted is hidden right in front of you. Let Dinan give you the keys so you can enjoy it.


  • More Power. Max gains of 169 WHP / 206 lb-ft of torque over stock on 104 octane and in conjunction with the Dinan big turbo and an upgraded intercooler.
  • Dinan Stage 2 performance software includes a limited lifetime warranty against defects in the software and provides free updates and reflashes as they become available. Labor or shipping charges are not included in the warranty.
  • Access to numerous octane calibrations depending on your needs (91, 93, 100 and 104). Switching between mappings would require a reflash at a Dinan authorized dealer.
  • Full map rescaling for drivability from idle to wide open throttle and everywhere in between.
  • Optimized boost control, cam phasing, fueling, airflow and temperature controls for maximum power output that is also safe and reliable.
  • Sport Cooling mode in sport / manual modes.
  • Top speed governor (VMAX) removed.
  • Upgradeable from DINANTRONICS Elite via trade-in program. Consult N55 FAQ below for details.
  • Retains all BMW factory engine damage safeguards and adds additional safety protections.
  • Torque gains drastically improve acceleration.
  • Downloads through the OBD2 Port - See compatability notice below for potential limitations.
Brand Dinan
Dinan Point Value3
Emission Code7
Factory Rated HP300 (318 Measured)
Factory Rated Torque (lb-ft)300 (303 Measured)
Install MethodDealer
Labor Time (Hours)0.5
Max HP Gain187 @ 4500 RPM (104 Octane)
Max Torque (lb-ft) Gain222 @ 4000 RPM (104 Octane)
Peak HP481 @ 6000 RPM (104 Octane)
Peak HP Gain162 @ 6500 RPM (104 Octane)
Peak Torque (lb-ft)520 @ 3500 RPM (104 Octane)
Peak Torque (lb-ft) Gain222 @ 4000 RPM (104 Octane)
Product TypeEngine Software
Required ItemsDinan Dual Core Intercooler (when applicable) (D330-0021) and Dinan Big Turbo (D310-0110A).
WarrantyLimited Lifetime Warranty
Part NumberD900-N55-S2

This part is legal under the provisions of EPA’s Tampering Policy dated November 23rd, 2020. The company has reasonable basis (test results) to verify that this product allows the vehicle to operate within legal emissions standards and is therefore legal to be sold for on-street use in all states that accept the legal provisions of the Clean Air Act and the EPA Tampering Policy. This product is NOT LEGAL FOR SALE OR USE IN THE STATE OF CALIFORNIA. Testing with the California Air Resources Board, in order to achieve 50-state compliance, is pending with CARB. Once testing is complete with California, and an E.O. number is issued, this product will be updated to 50-state legal status.
Neither the N55 based M2/X4 M40i nor N55 engines equipped with a pneumatic wastegate are supported with this version of software. D900-N55-S2 is specific to N55's with an electronic wastegate.
Limited Lifetime Warranty: See Details


BOX CODES: The N55 engine and its multitude of variants account for several 100 unique box codes across various platforms. While Dinan has created files for a great number of these permutations, there is a chance you may have a box code that we have not seen. If this happens to be the case we will need to create a file for your vehicle. This process could take several days and multiple dealer visits. 

ADVERTISED PERFORMANCE: Advertised performance data is based off of use of the Dinan Big Turbo and the Dinan Dual Core Intercooler in conjuction with the Dinan Stage 2 software. While we do not make an intercooler solution for all N55 vehicles alternative intercoolers may be used but may result in different performance gains or other unforseen limitations in cooling.

Dinan Stage 2 Performance Charts

Platform & OctaneSelect Graph Type

Calibration Quick Reference

All info supplied in the table below is 'at the crank' for consistency when comparing data with BMW advertised numbers which are always reported at the crank. For data 'at the wheels' please refer to the appropriate chart from the dropdowns above.

Table also represents all possible ECU software options currently available for the selected platform. Some stages / variants may require additional hard parts to achieve advertised numbers. Please consult the appropriate stages product page for details.

Stock as Reported by BMW 300 HP 300 LB-FT
Stock as Measured by Dinan 318 HP 303 LB-FT
STAGE 1 / LIMITED / $499.95
91 Octane 345 HP 379 LB-FT +66 HP +81 LB-FT
93 Octane 384 HP 414 LB-FT +92 HP +115 LB-FT
104 Octane 395 HP 430 LB-FT +105 HP +130 LB-FT
STAGE 2 / LIMITED / $549.95
91 Octane 426 HP 457 LB-FT +119 HP +152 LB-FT
93 Octane 436 HP 472 LB-FT +135 HP +172 LB-FT
100 Octane 468 HP 502 LB-FT +168 HP +205 LB-FT
104 Octane 481 HP 520 LB-FT +187 HP +222 LB-FT
Only use fuel equal to or higher than specified. Never use a lower octane fuel. Always follow our fuel guide, especially with race fuel and Ethanol, where available. Dynos are for reference only. Results will vary. Contributing factors include the vehicle condition, vehicle setup, dyno type, dyno setup, environmental factors, fuel quality, and more.

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    Some parts are not legal for use in California or other states with similar regulations.