2021 BMW 740i: +37.2 PS and +12.2 kg-m at the Wheels

This 2021 BMW 740i did not leave CarGym on a promise. It left with a DynoJet chart: 336.6 PS and 58.1 kg-m at the wheels, up from a measured baseline of 299.4 PS and 45.9 kg-m. That is a gain of 37.2 PS (+12.4%) and 12.2 kg-m (+26.6%), with peak torque arriving 300 rpm earlier.

The figures come from a three-step package on the G12 740i’s B58 3.0T: a Fogiago Dry Carbon Fiber Cold Air Intake System with a BMC High Performance Air Filter from Italy, xHP TCU tuning for sharper shifts and an exact-gear display, and Stage 2 ECU tuning by MS Tuning — then two pulls on the roller, recorded with DynoJet standard smoothing 5.

Sealed dry carbon, on the factory cold-air path

The first hardware change was the Fogiago intake, listed for BMW B58 3.0T applications including 5 Series G30/G38, 6 Series G32, 7 Series G12, and 8 Series G14. This 740i is a G12, so the kit is the correct chassis application, not a generic “fits most” box.

Fogiago designs a sealed dry-carbon intake that lines up with the factory inlet, so the engine draws air from the intended cold-air opening rather than the hot air around the TwinPower Turbo cover. An air baffle and guide are used to limit engine-bay heat entering the intake tract, and the sealed carbon volume is designed to support low-end torque while keeping intake noise down. The carbon shell is application-specific, heat-resistant, and non-yellowing, and it replaces the original plastic airbox. Each kit includes a BMC Italy high-performance air filter.

Once fitted, the carbon lid sits cleanly beside the factory engine cover. This is the 740i’s bay after the install, not a studio render.

xHP TCU: sharper shifts, exact gear on the cluster

More airflow only helps if the gearbox can use it. The 740i then received xHP TCU tuning for a faster, sharper shifting experience. The same upgrade also enhanced the dashboard so it displays the exact gear the transmission is in — shown here as D1. At the time of this work the car had 77,203 km on the clock: a real daily 7 Series, not a low-mile show car.

MS Tuning Stage 2, then the DynoJet numbers

Finally the ECU was flashed in the bay with a Stage 2 map by MS Tuning, and the 740i went on the DynoJet. The numbers below are wheel figures from the roller, not a crank estimate.

The 740i on the DynoJet roller, measured at the wheels after the Stage 2 flash.

The two overlays on the chart, recorded with standard smoothing 5, are:

• Baseline (RunFile_0, red): 299.4 PS at 5,500 rpm and 45.9 kg-m at 3,400 rpm
• After the package (RunFile_2, blue): 336.6 PS at 5,400 rpm and 58.1 kg-m at 3,100 rpm

Peak power is up 37.2 PS (+12.4%) and arrives 100 rpm earlier. Peak torque is up 12.2 kg-m — a 26.6% increase — and moves 300 rpm earlier, to 3,100 rpm. On the chart, the after-tune traces run above the baseline through the midrange and to the top of the pull. That earlier, larger torque peak is why this package matters on a 740i in everyday driving, not only at the redline.

The 37.2 PS and 12.2 kg-m at the wheels are the combined result of the intake, the xHP TCU tune, and the MS Tuning Stage 2 ECU, measured on this car. Shop the Fogiago Dry Carbon Fiber Cold Air Intake System for BMW B58 3.0T (7 Series G12 and other listed chassis) on cargym.com.