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Home / Guides

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Compatibility, real gains, sound: what you need to know before choosing.

  1. Sep 23, 2026 11 min BMW X4 M40i F26: the N55 in full voice, the exhaust system guideThe X4 M40i F26 is the sharpest version of BMW's coupé SUV, with the N55, a 3.0-litre turbocharged inline-six delivering 360 hp and 465 Nm. Yet...

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