Description
WP Stage 2 — 440–455bhp / 480–500ft/lb
Stage 2 removes the biggest restriction on the B58 — the factory downpipe and catalytic converter. With a free-flowing 4″ performance downpipe and high-flow panel filter fitted, the twin-scroll turbo can breathe properly, delivering 440–455bhp and 480–500ft/lb of torque.
The gains over Stage 1 go beyond peak numbers — turbo response sharpens noticeably, the mid-range fills in further, and the exhaust note comes alive. The B58’s forged internals are comfortably within their safe window at this power level, and the factory fuel system has no issues keeping up.
What’s included: Custom dyno calibration with before & after printout Hardware required: 4″ performance downpipe (decat or sports cat) · High-flow panel filter Recommended: ZF gearbox calibration (add-on) · NGK 94201 spark plugs
📖 Read our full BMW B58 Tuning Guide →
99 RON fuel required for optimal results. ⚠️ Decat downpipes may affect emissions compliance and MOT testing. Sports cat options available for road use.
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