The twin front pipes are bolted to the exhaust manifold, which is attached to the cylinder head. All parts are bolted or welded and can be replaced separately. Self-locking nuts and gaskets must be replaced after they have been removed.
Check the retaining rings and rubber pads for cracks, otherwise they should be replaced.
When installing a new exhaust system, it is also recommended to install new fasteners.
1 Front exhaust pipe
2 Self-locking nut
3 O-ring
4 Staple
5 Holder
6 Holder
7 Joint bush
8 Pre-silencer (or catalyst)
9 Coupling 61 mm
10 Rubber ring
11 Retaining ring
12 Holder
13 End silencer
14 Holder
1 Front exhaust pipe
2 Gasket
3 Nut
4 Staple
5 Holder
6 Lambda probe
7 Protective screen
8 Catalyst
9 flange
10 O-ring diameter 45 mm
11 O-ring diameter 42 mm
12 Holder
13 Front exhaust pipe holder
14 Holder
15 Retaining ring
16 Holder
17 Rubber ring
18 Holder
19 Bracket - 525i only
20 flange
21 O-ring diameter 45 mm
22 O-ring diameter 42 mm
23 Pre-silencer
24 Coupling (5201: 56 mm; 5251: 46 mm)
25 End silencer