F31 Tuning
BMW's 330i Touring, 340i Touring, 2016–2019. Powered by the B48/B58 engine family.
Stage pricing for the F31
Cooling, downpipe, fueling — the ceiling worth chasing on factory turbos.
Build this stage Stage 2 methodologyBigger fueling, often a hybrid or Phantom turbo. Per-car.
Build this stage Stage 3 methodologyThe F31 is the F30 3 Series Touring — the wagon version of the sedan, and the last 3 Series wagon BMW sold in the US (as the four-cylinder 328i, later 330i, xDrive Sports Wagon; the six-cylinder versions were mostly a European affair).
Mechanically it's pure F30 — the N20, later the B48 (with the B58 340i in Europe) — tuning the same way (full story on the F30 page), with the same caveats: the electric water pump, the oil-filter-housing gasket. What it adds is the wagon's practicality on the F30's willing platform.
So the F31 is the F30 you can load: same tuning, more room — and a rare BMW wagon that actually reached the States.
Parts that fit the F31
DR Forged wheels for the F31
Custom, made-to-order forged wheels — built to your car's spec, so any of them fits the F31. Pick the look; we build the fitment.
Tech essays for the F31
Tuning and Your Warranty: What's Reversible, and What's Actually Detectable
The honest version of the warranty question — what Magnuson-Moss actually says, what we flash back before a dealer visit, and what...
ReadUpgraded Stock-Frame Turbos: Response vs. Max Power — Why We Build Two
Why we build two upgraded stock-frame turbos: Stage 1 for response and driveability, Stage 2 for maximum power from the stock frame...
ReadBMW B58 Engine: Specs, Reliability, and How It Tunes
Reliable enough to daily to 200,000 miles, strong enough to run 600 wheel horsepower on stock internals. The rare engine where the...
ReadB48 Tuning Guide: Stages, Supporting Mods, and What Actually Holds Up
The definitive B48 platform reference for BMW and MINI owners: what each stage changes, which supporting mods Stage 2 needs, when the...
ReadBMW B48 Engine: Specs, Reliability, Problems, and How It Tunes
The engine we know best. Closed-deck, forged bottom end, and quietly related to a 600-hp DTM race engine. Specs, the real problems,...
ReadUpcoming events
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Set the F31 as your garage vehicle and the rest of the store filters to what fits it.
Set vehicleBefore you tune.
Will my dealer flag the tune at service?
The bootmod3 flash is non-destructive and reversible. Revert to stock before a dealer appointment and the ECU is back to factory in a few minutes; re-flash after service. We document the revert step in writing so the next person opening your file knows what's there.
Is it safe for the engine?
Every tune we ship has been datalogged on the car it was written for. We look at knock counts, fuel trims, boost behavior, and intake temps before we sign off. If the numbers don't sit right, we revise. That review and the revision policy are built into what the tune costs.
How long until I have a working tune?
Most calibrations turn around in a few days. We log, review, and revise before anything ships — we would rather get it right than get it out fast.
Can I go back to stock?
Yes. bootmod3 supports a stock revert that returns the ECU to factory calibration in under five minutes. The flash is non-destructive — nothing in the BMW DME is permanently modified. Most owners revert before trade-in.