F34 Tuning
BMW's 328i GT, 330i GT, 340i GT, 2014–2019. Powered by the N20/B48/B58 engine family.
Stage pricing for the F34
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 F34 is the 3 Series Gran Turismo — a taller, longer, fastback-hatchback take on the F30, with a big liftgate and stretched rear room. The engines mirror the sedan: 328i N20 (240 hp), 335i N55 (300 hp), later 340i B58 (320 hp), all tuning the same way (full story on the F30 page).
It's the oddball of the 3-series family — more practical and a touch softer than the sedan — but mechanically identical underneath, so it builds exactly the same. Honest notes per the F30 family (the water pump, the housing gasket).
So the F34 is the practical fastback 3: an unusual shape over the same tunable platform.
Parts that fit the F34
DR Forged wheels for the F34
Custom, made-to-order forged wheels — built to your car's spec, so any of them fits the F34. Pick the look; we build the fitment.
Tech essays for the F34
Upgraded 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...
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...
ReadUpcoming events
Cars & Coffee Delray Beach
Cars & Coffee Miami — Jungle Island Father's Day
Supercar Sundays Florida — Father's Day Car Show
Set the F34 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.