| Weistec Horsepower | 546 |
| Weistec Torque | 675 |
| CARB Exempt ID | D-691-4 |
| Manufacturer | Weistec |
| Street legal in all the US States | Yes |
| Engine Family | S55 |
| See more | |
| year | make | model | trim | engine |
|---|---|---|---|---|
| 2020 | BMW | M2 CS | 7AT (F87) | Twin Turbo 3L I6 (S55) |
| 2020 | BMW | M2 CS | 6MT (F87) | Twin Turbo 3L I6 (S55) |
| 2021 | BMW | M2 Competition | 7AT (F87) | Twin Turbo 3L I6 (S55) |
| 2020 | BMW | M2 Competition | 7AT (F87) | Twin Turbo 3L I6 (S55) |
| 2019 | BMW | M2 Competition | 7AT (F87) | Twin Turbo 3L I6 (S55) |
| 2018 | BMW | M2 Competition | 7AT (F87) | Twin Turbo 3L I6 (S55) |
| See more | ||||
Product Description
50 State Legal S55 ECU Calibration per EO # D-691-4.
All 2020 models require bench flashing at this time.
The Weistec S55 tune provides solid gains throughout the entire powerband, with significant peak-to-peak gains as well as large mid-range gains! This is on an otherwise 100% stock vehicle, including the air filters!
In addition to the performance gains, there are a couple of options available for race vehicles. First is the "Burble". The M4 GTS comes from the factory with this in a mild form. You can choose "Off" "Mild" or "Aggressive" for the "Burble". Many seem to prefer aggressive, but we gladly will let you choose based on your preference.
The other race vehicle option would be Catalyst Heating. On race vehicles, many times the catalysts are removed. In those cases, there is no need for the catalyst heating which would just be making excessive noise on a cold start of the race vehicle. If you have a race vehicle with the catalysts removed, Catalyst Heating can be disabled.
Cypher | Powered by Weistec
The Cypher is an optional upgrade when purchasing a Weistec tune for your Fxx series BMW. Simply navigate our website to the tune you wish to purchase. On the tune's product page, there will be a drop-down menu giving the option to add Cypher to your tune order. From there, the order is processed, and a Cypher tool will be shipped to you
- No need to send in your ECU / DME computer*
- Swap tunes file or return the stock within minutes.
*2019 Models manufactured after April 2019 that have recently received an update may not work with OBD2 flashing. All 2020 models require bench flashing at this time
What does all this mean to you? More power, sharper throttle response, and consistent performance without sacrificing refinement.
Related Items
How Do You Get Your BMW S55 ECU Tune Tuned?
Follow these steps — this is what your specific vehicle needs and supports.
2
Choose Your Tune Stage
3
Core Improvements
Standard with this tune4
Free Add Ons
Want it louder?
This tune can have Burble/Pops added or increased on deceleration, at no additional charge. Select an intensity below and we'll add it to your order, or mention it when requesting your tune — through the Cypher+ app, your calibration request form, or when placing your order.
Want to stop the stopping?
Auto Start-Stop can be turned off as part of your ECU tune alone, at no additional charge. Just mention it when requesting your tune — through the Cypher+ app, your calibration request form, or when placing your order.
5
See the full tuning process →
Pick Your Tuning Method
1Selected
Cypher Plus
Order a Cypher Plus and tune your car yourself from your phone, entirely through the MyFlasher app. Watch how it works.
2Selected — Pick return shipping at checkout
Mail It In
Remove your ECU or TCU and mail it to us for tuning. Required for some applications.
3Selected — Pick Will call at checkout
In Person
Bring your vehicle, or just your ECU/TCU, to our Anaheim, CA headquarters. Call 714-202-0005 or email sales@weistec.com to schedule.
4Selected — Order through your local dealer
Cypher Pro Dealer
Visit a certified Cypher Pro Dealer near you. Find one with our dealer locator.
6
Complete The Upgrade
An ECU tune alone won't remove all factory limits or fix how power reaches the ground. Add these to round out the upgrade with no limitations.
Read the full CPC & TCU breakdown →
What is a CPC module?
The CPC (Central Powertrain Control) is a separate control unit that manages things like the active exhaust valves, radiator fan, intercooler pumps, and speed limiter. On many newer Mercedes-Benz vehicles, it also houses torque limiters that can hold back an ECU tune from reaching its full potential.
What is a TCU tune?
A TCU (transmission control unit) tune delivers faster, firmer shifts with higher line pressure, reducing clutch slip and increasing the transmission's torque capacity. It's a worthwhile upgrade on its own, or paired with an ECU tune for a fully sorted powertrain.
Your Total
Good to Know
- This is a reflash of your original module, not a stand-alone unit.
- Power gains vary by vehicle, modifications, fuel, and operating conditions (ambient temperature, altitude, etc.).
- New or upgraded spark plugs are always recommended when tuning.
- Product may not be emissions compliant. Check local laws prior to installation.
- Always use a battery charger during programming.