M8 X 1.25 Exhaust Lock Nut with Insert Manifold Catalyst 1991-15 BMW 7 523 805
M8 X 1.25 Exhaust Lock Nut with Insert Manifold Catalyst 1991-15 BMW 7 523 805
M8 X 1.25 Exhaust Lock Nut with Insert Manifold Catalyst 1991-15 BMW 7 523 805
M8 X 1.25 Exhaust Lock Nut with Insert Manifold Catalyst 1991-15 BMW 7 523 805
M8 X 1.25 Exhaust Lock Nut with Insert Manifold Catalyst 1991-15 BMW 7 523 805
M8 X 1.25 Exhaust Lock Nut with Insert Manifold Catalyst 1991-15 BMW 7 523 805
M8 X 1.25 Exhaust Lock Nut with Insert Manifold Catalyst 1991-15 BMW 7 523 805
M8 X 1.25 Exhaust Lock Nut with Insert Manifold Catalyst 1991-15 BMW 7 523 805
M8 X 1.25 Exhaust Lock Nut with Insert Manifold Catalyst 1991-15 BMW 7 523 805
M8 X 1.25 Exhaust Lock Nut with Insert Manifold Catalyst 1991-15 BMW 7 523 805
M8 X 1.25 Exhaust Lock Nut with Insert Manifold Catalyst 1991-15 BMW 7 523 805
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  • Load image into Gallery viewer, M8 X 1.25 Exhaust Lock Nut with Insert Manifold Catalyst 1991-15 BMW 7 523 805
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M8 X 1.25 Exhaust Lock Nut with Insert Manifold Catalyst 1991-15 BMW 7 523 805

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Qty of 2 BMW Genuine Exhaust Manifold / Catalyst Copper Collar Nut M8 — 18 10 7 523 805 / 18107523805


  • ✅ Genuine BMW OEM Part – Copper self-locking collar nut designed for exhaust system use.

  • ✅ Part Number: 18 10 7 523 805 (18107523805).

  • ✅ Cross-Reference / Replaces:  18 10 0 394 328.

  • ✅ Thread Size: M8 x 1.25 (8mm).

  • ✅ Material: Copper – heat-resistant and corrosion-resistant.

  • ✅ Placement on Vehicle: Exhaust manifold, catalytic converter flange, turbo/downpipe connections.

  • ✅ Fitment: Used across multiple BMW models, including E31, E32, E34, E38, E39, E53 X5, E60/E61 535i/545i/550i, E63/E64 645Ci/650i, E71 X6 35i, E82/E88 135i/1M, E90/E92/E93 335i/335is, F02 760Li, Z4 35i/35is (check part number for your vehicle).

  • ✅ OEM Quality: Maintains proper clamping force under high-heat cycling and vibration.

  • ✅ Best Practice: Replace old exhaust nuts when servicing manifolds, turbos, or catalytic converters to prevent leaks.

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