2021+ BMW M1000RR Stage //M+ Flash



Unlock Your M1000RR’s True Potential

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Product Description


US and European model M1000RR’s have been restricted from the factory with the US models having worse restrictions than it’s European counterpart. Stage //M+ was developed to remove these restrictions and unlock your M1000RR’s full potential.


  • Derestricted Throttle
  • Derestricted Exhaust Valve
  • RPM Limiter Raised
  • Better Fueling
  • Heat Management
  • Warm Up Changes


THROTTLE RESTRICTION – Giving you the ability to utilize 100% of the throttle is paramount in track situations where you need all the power you can get on demand. The factory file has “dead spots” that may cause the M1000RR to behave in an unpredictable manner when corner exiting. This also means any kind of straight line acceleration also suffers. We remove these factory restrictions to ensure a smooth and predicable throttle, all the way to redline.

EXHAUST VALVE – The exhaust valve is a double edged sword. It does good by making back pressure when needed but also hinders the 2021+ M1000RR from making the most power possible at mid to upper RPM ranges. The valve closed makes the bike a lot more quiet than if it were open. Even slip-on exhaust sounds almost the same as stock due to this valve closing so much. Opening this valve for racing use allows for some horsepower gains, as they are gear and RPM dependent. Just like the butterfly valves for the throttle. Lower gears will reduce sound and power by 3-5HP by opening the valve less then 100%, even in high RPM’s. Our mapping still utilize the stock exhaust valve to give you maximum power but also opens it up when you need to make peak power gains and the sound you want.

RPM LIMITER – The stock RPM limiter is set to 15,100 RPM. We have been testing 15,300 RPM with zero negative side effects. The M1000RR’s factory configuration actually varies in RPM from gear to gear, something we haven’t seen in BMW till now, but have seen in Ducati for quite some time. We set the RPM limiter for 15,300 RPM in all gears.

FUELING – The 2021 BMW M1000RR fueling is rich for exhaust gas temperature purposes but it’s complete overkill. It is also set artificially lean at idle, cruise, and warm up, which results in stalling and cold/hot start issues. The new M1000RR is factory equipped with 5-wire widebands (just like the 2020+ S1000RR) and is very precise on targeting a specific AFR (Air/Fuel Ratio) through a closed loop corrective system from idle to redline. Being factory rich also helps it cool the turtleshell exhaust system. However, fuel can be trimmed for better result as it targets real time fuel corrections (think Dynojet PC5 Autotuner but better). Luckily this is the death of the piggyback fuel controller and custom dyno tuning. We program the M1000RR to target a better AFR (Air/Fuel Ratio) to make a little more power along with fixing drivability and idle.

HEAT MANAGEMENT – Let’s face it, this bike rides a little on the hot side. Due to the new exhaust system and idle/cruise AFR mixtures the bike is a recipe to being constantly in the 215+F range and burning your legs while you ride, making it uncomfortable anywhere you’re not going 50+MPH. We have solved this issue by adding our low fan temp modification to this flash as a standard baseline feature along with different cruise mapping which has curbed temps extensively.


  • 10HP gain in top end RPM
  • 2-4hp from exhaust valve management
  • Cooler riding temps
  • Warm up stalling issue resolved
  • Improved throttle response in all gears
  • Longer and smoother powerband
  • Better exhaust note (as bike is silent stock due to exhaust valve)


650ib tests our M1000RR flash independently to see what kind of hp gains can be made over stock in the US spec 2021 BMW M1000RR

100% stock M1000RR on the dyno with our ///M+ flash. This bike has the ability to make 200whp completely stock with just our flash and no other mods. You can also see our attention to detail on the AFR (air/fuel ratio).


This is a pretty drastic contrast. Doesn’t even look like the same bike! The throttle restrictions on the US spec M1000RR rob a significant amount of power in almost every gear. We pictured second gear because it has the worst restrictions. You’re seeing it right, that’s a gain of over 50whp from stock to flashed at almost 13,500 RPM.


For those that don’t really understand how we get so much power from a simple ECU flash, it’s really quite simple. From the factory, the M1000RR is SEVERELY restricted. These restrictions are software based and can be removed with our flash. How bad are the factory restrictions? See the graph below. The numbers represent a maximum % of throttle allowed by the ECU based on the rider commanding 100% throttle twist. You can see some portions are down to 35%! We simply fix this to command a full derestriction so you can get all your power back.


The M1000RR seems to suffer the same warm up issues as the 2020+ BMW S1000RR. On the stock tuning you can hear the bike struggling to stay on. It lean pops and sputters until it shuts itself off. Luckily we have a fix for it! Our //M+ for the M1000RR not only fixes the warm up and idle issue. You can hear the bike have a steady and healthy idle with no popping or sputtering.

Affirm Financing



Thoroughly tested by our own engineers, not just for its function but also durability.  We purposefully dropped this thing about 100 times just to make sure if you accidentally dropped it, it would still be a usable device.

So why buy it when you can just send in your ECU for flashing and spend less? Let’s see the breakdown.

NO DOWNTIME – No need to send in your ECU or remove it from your bike at all.  You order the handheld, it get’s delivered to you, you flash your bike.  You never miss a day of riding and no effort removing the ECU.

STORE MULTIPLE MAPS – When you send in your ECU, you only get one map.  You might be thinking, “why would I need more than one map?”.  Storing multiple maps means you’re able to flash for different fuels.  If you’re a serious track competitor, we can work with you to get you different mapping for different tracks.  If, for example, you’re add an exhaust to your stock bike, we can email you a file that takes the new exhaust into account with the changes you need to optimize your bike’s new modifications.

GO BACK TO STOCK ANYTIME – Not only can you store multiple race maps, you can also flash the original, stock file back into the bike at any time and for any reason.


Additional information

Weight 15 lbs
Dimensions 15 × 15 × 15 in


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  • “ Bike is running awesome and no out of the ordinary popping under load during downshifts at high rpm. My hats off to your team for making me feel like I have a personal tuner at my disposal. Really appreciate the quick turnaround to get me straight. I can definitely feel the extra power! ”

    Andy Young - Maryland Aug 28, 2018
  • “ This product is amazing.  I feel like I have a better version of my bike.  Like it should have come this way.  The throttle smoothness and even power band make it a joy to ride.  I no longer feel as if I'm riding a wild bronco lol. Thank you again, I didn't think that a L-twin could behave this well.  Also, your customer service is the best.  I could always reach you by email or phone.  I will tell everyone I know about this fantastic addition.  Keep up the great work, guys! ”

    Dan Martinez May 01, 2017
  • “ I have a 2015 S1000RR and was extremely skeptical when I heard about BrenTuning and the power they got out of an ECU flash.  After speaking with the team at BrenTuning, all my hesitations were put to rest and I haven't stop winning first place trophies since! BELIEVE THE HYPE! ”

    Troy Gleason - California Jul 10, 2016
  • “ Bren and his team did an awesome job on my bmw s1000rr. Went from 179rwhp an 83 rwtq to 206 rwhp and 93rwtq. Customer service was great and I highly recommend them for any of y'all that want to make that power!! ”

    Paul Jackson - Texas Jul 10, 2016
  • “ Purchased the tune for my 2015 BMW S1000RR. Was skeptical at first and initially had a bunch of questions. Chris was very patient with me and answered them all. Had some problems after receiving my ecu back and Chris was very helpful in getting all my issues worked out. Bike runs fantastic. Definitely worth it. Thank you again guys for dealing with my questions and taking care of everything before and after the purchase. Fantastic customer service. ”

    Cody Hunsucker - Tennessee Jul 10, 2016
  • “ After doing some research it was obvious that Brentuning was the best option for tuning of my S1000RR. I wont go into details but after multiple overnighting of parts to me at no additional charge, I'm really impressed and satisfied with the end result and I haven't even tried out my race fuel tune yet! To top if off I received a random care package of goodies from Chris today. The customer service at Brentuning is probably the best I've received from any business I've dealt with. Their email response times are unreal as well, lol. Literally sometimes instantly, kinda weird. lol. I would recommend any and everyone to Brentuning for your S1000RR tuning solution. If anyone has any questions or are hesitant before purchasing, feel free to shoot me a message and I'll help / assist / give you a more detailed opinion on my experience as well. ”

    Trey Hull - Texas Jul 10, 2016
  • “ I have the Bren Tuning ECU flash on my 2015 BMW S1000RR and it is unbelievable how fast this bike is. This tune is the best thing I got for my bikes. I have also did the Bren Tune for my 2014 BMW S1000r for which it just made this bike really nice. Bren Tuning is the best. ”

    Darnell Edwards - Maryland Jul 10, 2016
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