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FATHERS DAY SALE -- 10% OFF SITEWIDE -- CODE: FATHERS10 -- ENDS 6/22
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We wanted documented, real-world S58 E50 dyno numbers, not forum estimates. The G82 M4 Competition comes equipped with the S58 motor, a 3.0L Twin-Turbo inline-six with a factory claimed 503 hp and 479 lb-ft of torque at the crank. This test gives us a clear before-and-after picture of what the platform is actually capable of on E50 fuel.
The stock baseline was pulled first to establish exactly where the car starts. ARM bolt-ons were then installed, the car was tuned on E50 with BM3, and we pulled again. If you have been searching for real M4 E50 dyno data, this is it.
Test Vehicle: 2022 BMW G82 M4 Competition xDrive, S58 3.0L Twin-Turbo
Dyno: Dynojet
Fuel (Stock Baseline): 93 Octane Pump Gas
Fuel (FBO): E50
Tune: BM3 E50
Modifications: ARM S58 Resonated Downpipes, 4.5" Single Midpipe, Intake, and Turbo Inlets
| Run | Configuration | WHP | WTQ |
|---|---|---|---|
| 1 | Stock | 449 | 443 |
| 2 | ARM + E50 | 656.85 | 674.44 |
| 3 | ARM + E50 | 658.77 | 670.41 |
| 4 | ARM + E50 ★ Best | 662.88 | 674.72 |
All three E50 pulls landed within 6 WHP and 4 WTQ of each other. That level of consistency is exactly what we wanted to see, the tune is stable, the hardware supports it, and the numbers are repeatable.
The S58 is strong out of the box. It builds boost quickly and makes respectable power. On E50, the character of the engine changes entirely. The torque curve does not just go up, it widens. By 3,000 RPM the car is already deep into a massive torque plateau, holding well over 600 ft-lbs to the wheels across most of the rev range. That plateau is the story. It is not a peaky tune that you have to rev out to find the power. The power is there from the moment you ask for it, and it stays there all the way to the fuel cut near 7,100 RPM.
The horsepower curve climbs steadily through the mid-range, peaks just shy of 6,000 RPM, and holds strong through the top end. Compared to the stock pull, the difference is not just magnitude, it is shape. Opening up the exhaust and intake flow gives the BM3 tune a clean foundation to work from, and on E50, it takes full advantage of it.
The result is a curve that is broad, smooth, and consistent run after run — not a peaky, narrow spike, but a wall of torque that the S58 holds from low in the rev range all the way to redline.
Over 200 wheel horsepower and 230 wheel-torque gained on the stock turbos. No turbo upgrade. No engine internals. The S58 had this capability from the factory, BMW just left it on the table.
What makes this result meaningful beyond the peak numbers is where the gains live. The torque advantage over stock is present from the very bottom of the rev range and holds all the way through. Every gear change, every on-ramp, every moment you get on the throttle, you are driving a car that is pulling significantly harder than stock across the entire powerband. That is not something you feel only at wide open throttle on a track. It changes how the car drives everywhere.
The G82 M4 Competition xDrive is a serious performance car out of the box. But this M4 dyno data makes clear that the S58 is built for more than BMW delivers from the factory. On E50 with the right supporting modifications to let the engine breathe, the platform responds with over 200 additional wheel horsepower and a torque curve that transforms the driving experience. The G8X dyno numbers speak for themselves — this is what the S58 is capable of.
If you are building your S58, browse the full ARM S58 collection or call us with any questions about fitment and configuration.
Shop S58 PartsOn a full bolt-on build with a BM3 E50 tune, this 2022 G82 M4 Competition xDrive made 662.88 WHP and 674.72 WTQ on a Dynojet dyno. Results will vary based on supporting modifications, tune, and dyno type, but this represents a strong real-world benchmark for the S58 on E50.
In this test, the stock 2022 G82 M4 Competition xDrive made 449 WHP and 443 WTQ on a Dynojet dyno on 93 octane pump gas. BMW rates the S58 at 503 hp at the crank from the factory.
On a Dynojet with bolt-on modifications and a BM3 E50 tune, realistic S58 E50 dyno numbers are in the 650 to 670 WHP range and 665 to 680 WTQ range on the stock turbos. This build hit 662.88 WHP and 674.72 WTQ across three consistent pulls.
In this test, the S58 gained 213.88 WHP and 231.72 WTQ going from stock 93 octane to a full bolt-on build on E50 with a BM3 tune. That is a 47.6% increase in wheel horsepower and a 52.3% increase in wheel torque, all on the stock turbos.
The data says yes. E50 allows the BM3 tune to run more aggressive fuel tables with significantly better knock resistance than pump gas, and the S58 responds with a broader, flatter torque curve that improves drivability across the entire RPM range, not just at peak power.
This build used ARM S58 Resonated Downpipes, a 4.5" Single Midpipe, Intake, and Turbo Inlets, paired with a BM3 E50 tune. No turbo upgrade, no engine internals. All gains are from bolt-on modifications and fuel on the stock S58 turbochargers.
, The ARM Team
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