Fits 2020–2024 · Stage 1 and Stage 2 · Mail-in
$3,199
Stage 1
495hp
500lb-ft
From 382 hp / 369 lb-ft stock
The car
From the start, the G20 3 Series had an M Performance model: the M340i, which reached the US in summer 2019 as a 2020 model and replaced the 340i as the six-cylinder 3 Series. It sits between the four-cylinder 330i and the M3 (G80), and an M Sport limited-slip differential is standard.
There is no manual: the single-turbo 3.0-liter six sends its power through an eight-speed Sport Steptronic to the rear wheels or, with xDrive, to all four. From the 2021 model year the engine works with a 48-volt mild-hybrid system. BMW quotes 0–60 mph in 4.4 seconds for the rear-drive car and 4.1 to 4.2 seconds for the M340i xDrive.
The 3 Series was facelifted for the 2023 model year, with US sales from July 2022, so the catalog’s 2020 to 2024 range covers the M340i before and after that update.
On a 2024 car, Stage 1 is calibrated for the car as it left the factory and takes it from 382 hp and 369 lb-ft to 495 hp and 500 lb-ft on pump-grade fuel. Stage 2 is calibrated for supporting bolt-on modifications and high-octane fuel, for 515 hp and 565 lb-ft. The gearbox has its own controller and torque limits, so the optional TCU tune raises them to match, with sharper shifts and stronger clutch clamping.
Figures & prices
Factory and tuned horsepower and torque from our catalog, with prices for each stage and add-on.
| Model year | Factory | Stage 1 | Stage 2 | Add-ons |
|---|---|---|---|---|
| 2021–2024 | 382 hp / 369 lb-ft | 495 hp / 500 lb-ft $3,199 | 515 hp / 565 lb-ft $3,299 | TCU tune $1,999 |
| 2020 | 382 hp / 369 lb-ft | 495 hp / 500 lb-ft $1,599 | 515 hp / 565 lb-ft $1,699 | TCU tune $1,999 |
Tuned figures are estimates, not guarantees. Actual results vary with the car’s condition and modifications, fuel quality and octane, temperature, altitude and the dyno used. See our Terms of Service.
How it works
Choose your year, stage and add-ons and check out securely.
Pack it with your printed order confirmation email and send it to our Phoenix shop.
Within two business days of it arriving.
Return shipping is on us. Reinstall and drive.
FAQ
More answers in our FAQ
Our online catalog lists Stage 1 and Stage 2 tunes for 2020–2024 BMW M340i (G20) models. Choose your year at the top of the page; figures and prices for each year are shown in the table above.
The 340i (F30) is the previous generation, sold as a sedan through 2018 with a manual gearbox available. The M340i moved to the larger G20 body, became automatic-only, gained a standard M Sport differential and carries an uprated version of the B58 six.
They share the engine, gearbox and drivetrain, but the M440i (G22 / G23 / G26) is the coupe, convertible and Gran Coupe family, with its own body and a tall kidney grille that reaches the bottom of the bumper. The M340i is the sedan, with the conventional 3 Series front end.
Stage 1 is calibrated for the car as it left the factory and runs on pump-grade fuel. Stage 2 pairs the calibration with supporting bolt-on modifications such as downpipes and runs on high-octane fuel. On a 2024 car, Stage 1 takes it from 382 hp to 495 hp. Stage 2 takes it to 515 hp.
A TCU tune is available as an add-on ($1,999). It raises the transmission’s torque limits and sharpens the shifts so the gearbox can handle the extra power. Ship your TCU in the same box as your ECU.
More BMW tunes
Contact
Customers across the US order online and mail us their ECU. Our shop is at 952 W Melinda Ln, Suite D in north Phoenix (Deer Valley, 85027), and local owners are welcome to bring their car in. Call, visit or send us an inquiry.