06/07/2026
BMW X5 G65 chip tuning: X5 40 or X5 40d first?
The new G65 X5 just dropped and we have not had it on the dyno yet, but we are already planning the runs. Two inline sixes, two very different characters.
X5 40 runs the B58 petrol with 394 HP and 580 Nm, the same powertrain we know from the 740 facelift (G70 LCI). We have squeezed serious extra power out of the B58 before, so the potential here looks strong.
X5 40d brings 308 HP and 650 Nm from the B57 diesel, quite possibly one of the last of its kind. A torque monster basically built for tuning.
Our RaceChip GTS5 adds more power and torque without touching the factory hardware and stays fully reversible and we cannot wait to dial it in on the G65 once one hits our bench.
So tell us: which one should we put on the dyno first, the 40 or the 40d? Drop your pick in the comments, and let us know what you think of the „Neue Klasse“ design while you are at it.