Exhaust systems - standard 1959-85

Exhaust Systems
All systems shown are mild steel or aluminised, as available. For stainless steel, contact Somerford Mini. All silencers are now oval-ended (some used to be crimped) but are dimensionally as original.

Saloon 848cc, 1959-67
The later GEX106 system can be modified to replace this exhaust system; please contact us for details.
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
1	GEX135	EXHAUST SYSTEM, complete, single box	1	With engine bracket.
2	21A1408	DOWNPIPE ASS'Y, with engine bracket	1	Included in complete system.
3	GEX3288	SILENCER, bare	1	Included in complete system.
4	GEX1392	TAIL PIPE, bare	1	Included in complete system.

Saloon 848cc and 998cc, 1967-73 (not Cooper)
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
5	GEX106	EXHAUST SYSTEM, complete, single box	1	Accepts gearbox bracket.
6	GEX1390	DOWNPIPE, bare	1	Included in complete system.
7	GEX3288	SILENCER, bare	1	Included in complete system.
8	GEX1392	TAIL PIPE, bare	1	Included in complete system.

Saloon 848cc, 998cc and 1098cc, 1974-85 (not Japan, 1980-85)
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
9	GEX189	EXHAUST SYSTEM, complete, twin box	1
10	GEX1522	DOWNPIPE, bare	1	Included in complete system.
11	GEX3498	SILENCER, front, with intermediate pipe	1	Included in complete system.
12	GEX3288	SILENCER, rear, bare	1	Included in complete system.
13	GEX1562	TAIL PIPE, bare	1	Included in complete system.
14	GEX1954	FINISHER, tail pipe, 1 5/16" int. dia.	1	Optional fitment, plus limited editions.
	GEX1830	FINISHER, tail pipe, 1 1/2" int. dia.	1	Optional fitment, plus limited editions.

Saloon 998cc, Japan 1980-85
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
15	NAM3330	DOWNPIPE ASSEMBLY	1
16	ADU6387	CATALYTIC CONVERTER ASS'Y	1
17	NAM3332	EXHAUST SYSTEM, twin box	1

Cooper and Cooper S, 1961-67 (Single Box)
By the end of the 1960s the factory superseded this single box system with the twin box type shown further down the page, which fits as a straight swap for the earlier design. The single box system is now rarely seen and is included here mainly for reference purposes.
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
18	21A809	EXHAUST SYSTEM, complete, single box	1	Not certain export markets.
19	ARA1519	FRONT PIPE, bare	1	Included in complete system.
20	GEX3234	SILENCER, rear, with tail pipe	1	Included in complete system.

Cooper and Cooper S, 1961-69 (Triple Box; Some Export Markets)
The availability story of the triple box system is the same as for the single box system, described above. The later twin box system may be used as a direct replacement.
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
21	ARA222	EXHAUST SYSTEM, complete, triple box	1	Certain export markets only.
22	ARA1993	FRONT PIPE, bare	1	Included in complete system.
23	ARA2002	SILENCERS ASS'Y, front	1	Included in complete system.
24	ARA1868	INTERMEDIATE PIPE, bare	1	Included in complete system.
25	GEX3234	SILENCER, rear, with tail pipe	1	Included in complete system.

Cooper and Cooper S, 1967-71 (Twin Box)
Fitted as standard on late Cooper and Cooper S models, this twin box system may also be used on earlier cars. Alternatively, the very similar RC40 system (which utilises the same mountings) can be fitted - please see the ‘Exhaust Systems - Uprated’ section of the Somerford Mini catalogue for details.
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
26	GEX117	EXHAUST SYSTEM, complete, twin box	1	Will replace earlier systems.
27	GEX1287	FRONT PIPE, bare	1	Included in complete system.
28	GEX1420	SILENCER, front, with intermediate pipe	1	Included in complete system.
29	GEX3234	SILENCER, rear, with tail pipe	1	Included in complete system.

1275 GT, 1969-80
Note that as with the twin box Cooper system, the RC40 system in the ‘Exhaust Systems - Uprated’ section can be fitted as a very closely matching alternative to the original 1275 GT item listed here.
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
30	GEX121	EXHAUST SYSTEM, complete, twin box	1
31	GEX1421	DOWNPIPE, bare	1	Included in complete system.
32	GEX1420	SILENCER, front, with intermediate pipe	1	Included in complete system.
33	GEX3234	SILENCER, rear, with tail pipe	1	Included in complete system.

Traveller, Van and Pick Up, 1960-67
The later GEX107 system can be modified to replace this exhaust system; please contact us for details.
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
34	GEX118	EXHAUST SYSTEM, complete, single box	1	With engine bracket.
35	21A1411	DOWNPIPE ASS'Y, with engine bracket	1	Included in complete system.
36	GEX3233	SILENCER, with tail pipe	1	Included in complete system.

Traveller, Clubman Estate, Van and Pick Up, 1967-73
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
37	GEX107	EXHAUST SYSTEM, complete, single box	1	Accepts gearbox bracket.
38	GEX1286	DOWNPIPE, bare	1	Included in complete system.
39	GEX3233	SILENCER, with tail pipe	1	Included in complete system.

Clubman Estate, HL Estate, Van and Pick Up, 1974-84
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
40	GEX155	EXHAUST SYSTEM, complete, twin box	1
41	GEX1522	DOWNPIPE, bare	1	Included in complete system.
42	GEX3463	SILENCER, front, with intermediate pipe	1	Included in complete system.
43	GEX3288	SILENCER, rear, bare	1	Included in complete system.
44	GEX1393	TAIL PIPE, bare	1	Included in complete system.

Exhaust Fixings
Not Cooper, Cooper S or 1275 GT
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
45	EFK001	EXHAUST FITTING KIT, complete	1	1967-85, Saloons.
	EFK002	EXHAUST FITTING KIT, complete	1	1967-84, Estates, Van and Pick Up.
46	2A237	CLAMP ASSEMBLY, downpipe to manifold	1	Original two bolt design (a.k.a. 18G8581).
47	GEX7046	CLAMP ASSEMBLY, downpipe to manifold	1	Quick fit single bolt design.
48	BH605181	BOLT, clamp	2/1	Included in clamp assemblies.
49	PWZ105	WASHER, plain	4/2	Included in clamp assemblies.
50	GHF261	NUT	2/1	Included in clamp assemblies.
51	SH505081	SCREW, 5/16 UNC, downpipe bracket to engine	1	1959-60; downpipes with engine bracket.
52	LWZ205	WASHER, locking	1	1959-60; downpipes with engine bracket.
53	PWZ105	WASHER, plain	1	1959-60; downpipes with engine bracket.
54	BH605121	BOLT, 5/16 UNF, downpipe bracket to engine	1	1960-63; downpipes with engine bracket.
55	21A543	WASHER, bracket	1	1960-63; downpipes with engine bracket.
56	21A428	SHIM, bracket	A/R	1960-63; downpipes with engine bracket.
57	PWZ105	WASHER, plain	1	1960-63; downpipes with engine bracket.
58	LNZ105	NUT, Aerotight	1	1960-63; downpipes with engine bracket.
59	BH606131	BOLT, 3/8 UNF, downpipe bracket to engine	1	1963-67; downpipes with engine bracket.
60	21A1148	WASHER, bracket	1	1963-67; downpipes with engine bracket.
61	21A1147	SHIM, bracket	A/R	1963-67; downpipes with engine bracket.
62	LNZ106	NUT, Aerotight	1	1963-67; downpipes with engine bracket.
63	GEX7337	BRACKET, downpipe, gearbox	1	1967-73; direct or remote gearchange.
64	GEX7526	BRACKET, downpipe, gearbox	1	1973-85; rod gearchange.
65	GEX7053	CLIP, downpipe	1	1967-85; downpipes accepting gearbox bracket.
66	SH605061	SCREW, clip to downpipe	1	1967-85; downpipes accepting gearbox bracket.
67	PWZ105	WASHER, plain	1	1967-85; downpipes accepting gearbox bracket.
68	SH605051	SCREW, clip to bracket	1	1967-85; downpipes accepting gearbox bracket.
69	LWZ205	WASHER, locking	2	1967-85; downpipes accepting gearbox bracket.
70	FNZ105	NUT	2	1967-85; downpipes accepting gearbox bracket.
71	GEX7081	MOUNTING, intermediate	1
72	GEX7052	CLIP, intermediate	1
73	GEX7082	STRAP, clip to mounting	1	Saloon.
	GEX7273	STRAP, clip to mounting	1	Estates, Van and Pick Up.
74	SH605051	SCREW, mounting to body	2
75	SH605061	SCREW, clip to exhaust	1
76	LWZ205	WASHER, locking	4
77	FNZ105	NUT, strap and clip	2
78	GEX7251	MOUNTING, rear	1
79	GEX7084	CLIP, rear	1	Saloon.
	GEX7272	CLIP, rear	1	Estates, Van and Pick Up.
80	SH605061	SCREW, clip to exhaust	1
81	FNZ105	NUT, mounting and clip	3
82	LWZ205	WASHER, locking	3
83	EC36	CLAMP, U bolt type, 1 3/8"	A/R

Japan 1980-85
The Japan market exhaust system utilises all of the relevant downpipe, intermediate and rear mountings listed above, plus the following heatshields, heatshield mountings and catalytic converter fixings:
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
84	GEX7750	GASKET, catalytic converter	2
85	NV110041	NUT, nyloc	4
86	PWZ106	WASHER, plain	4
87	NAM3525	HEATSHIELD, underfloor	1
88	NAM2906	HEATSHIELD, downpipe and catalyst	1
89	NAM2907	HEATSHIELD, exhaust system	1
90	NAM3337	BRACKET, downpipe heatshield mounting, front	1
91	NAM3913	U BOLT	1
92	WC108051	WASHER, plain	2
93	NV106041	NUT, nyloc	2
94	NAM3343	BRACKET, downpipe heatshield mounting, rear	2
95	ADU6671	O RING, heatshield to bracket	2
96	SH108161	SCREW, heatshield to exhaust system	6
97	WC108051	WASHER, plain	6
98	SH105201	SCREW, heatshield to floor	4
99	PWZ104	WASHER, plain, small	8
100	WC108051	WASHER, plain, large	8
101	LWZ204	WASHER, locking	4
102	NH105041	NUT	8

Cooper, Cooper S and 1275 GT
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
103	RC40FK	EXHAUST FITTING KIT	1	Includes clamps instead of wire clips.
104	EXCL04	CLIP, front pipe securing	1	Cooper and Cooper S.
105	SH505081	SCREW, clip to gearbox extension	1	Cooper and Cooper S.
106	LWZ205	WASHER, locking	1	Cooper and Cooper S.
107	31G920	CLAMP ASS'Y, downpipe to manifold, two bolt type	1	1275 GT.
108	GEX7304	CLAMP ASS'Y, downpipe to manifold, quick fit type	1	1275 GT.
109	BH605181	BOLT, clamp	2/1	Included in clamp assemblies.
110	PWZ105	WASHER, plain	4/2	Included in clamp assemblies.
111	GHF261	NUT	2/1	Included in clamp assemblies.
112	GEX7337	BRACKET, downpipe, gearbox	1	1275 GT, 1969-73; remote gearchange.
113	GEX7526	BRACKET, downpipe, gearbox	1	1275 GT, 1973-80; rod gearchange.
114	GEX7053	CLIP, downpipe	1	1275 GT.
115	SH605061	SCREW, clip to downpipe	1	1275 GT.
116	PWZ105	WASHER, plain	1	1275 GT.
117	SH605051	SCREW, clip to bracket	1	1275 GT.
118	LWZ205	WASHER, locking	2	1275 GT.
119	FNZ105	NUT	2	1275 GT.
120	GEX7081	MOUNTING, intermediate	1
121	GEX7248	BRACKET, exhaust system to mounting	1
122	SH605051	SCREW, mounting to body	2
123	FNZ105	NUT, bracket to mounting	1
124	LWZ205	WASHER, locking	3
125	HCS130	CLIP, exhaust system to bracket	1
126	GEX7251	MOUNTING, rear	2
127	GEX7249	BRACKET, exhaust system to mountings	1
128	FNZ105	NUT, mounting and bracket	4
129	LWZ205	WASHER, locking	4
130	HCS130	CLIP, exhaust system to bracket	1

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Exhaust systems - standard 1959-85

SET SCREW- 5/16 UNC x 1''

NUT-AEROTIGHT-3/8 UNF

NUT-BRASS-5/16 UNF-MANIFOLD TO CYLINDER HEAD-STD LENGTH

CLIP-HOSE,WIRE TYPE- 55-45mm- ( COOPER & 'S' TAILPIPE ETC )

BOLT-5/16 UNF x 1 1/2''

WASHER-PLAIN M8 x 25mm

SET SCREW-5/16'' UNF x 3/4''

WASHER- PLAIN 3/8 ID SMALL OD

NUT-AEROTIGHT 5/16'' UNF

BOLT-5/16 UNF x 2 1/4''

NUT-M5 METRIC FINE

WASHER - PLAIN - 5/16"

We accept