F-Chassis · F26

F26 Tuning

BMW's X4 xDrive35i, 2014–2018. Powered by the N55 engine family.

Stage pricing for the F26

Stage 1
Tune
$495

Where every build starts. Calibration only.

Build this stage Stage 1 methodology

The F26 is the first X4 — the F25 X3 with the coupe-SUV roofline, and notable for introducing the X4 M40i, the model's first M Performance variant. The lineup: xDrive28i N20 four (around 240 hp), xDrive35i N55 six (306 hp), and the M40i N55 (around 355 hp) — the hottest of the bunch.

All of it tunes like the N20/N55 cars it shares engines with (N55 story on the F30 page). The M40i is the one to chase for the straight-six platform; the 28i is the efficient daily. Honest notes are the N20/N55 family items.

So the F26 is the original coupe-SUV X4: the F25's mechanicals, the swept roof, and the first taste of an M40i.

Parts that fit the F26

DR Forged wheels for the F26

Custom, made-to-order forged wheels — built to your car's spec, so any of them fits the F26. Pick the look; we build the fitment.

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Set the F26 as your garage vehicle and the rest of the store filters to what fits it.

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Before 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.