Exhaust systems - uprated

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Medium Bore LCB Exhaust Manifold, Stage II, For Catalyst Fitment
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CAT REPLACEMENT PIPE
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EXHAUST CLAMP-1 7/8" 'U' TYPE
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EXHAUST CLAMP-2" 'U' TYPE
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EXHAUST CLAMP- 2 1/8" 'U' TYPE
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MANIFLOW FREEFLOW MANIFOLD
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RC40 SIDE EXIT REAR BOX ONLY
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EXHAUST SYSTEM-WORKS RALLY
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Maniflow Manifolds and Exhaust Systems    
Founded by ex-Downton Engineering staff member Dave Dorrington in 1971, Maniflow are the most respected and experienced Mini exhaust manufacturers in the industry today.  Their range of products includes something for everyone, from the original Freeflow manifold through to full-blown competition manifolds and systems.
         
We've listed here the Maniflow items we regularly stock and sell, but with a range as big as theirs there's plenty more besides; as usual, if you can't see what you want or need more information on the parts listed, please contact us and we'll do our best to ensure you get exactly the right exhaust system for your requirements.
         
Note: The fitment of some of these manifolds and systems may result in the deletion of the catalytic converter from cars originally so equipped.  Owners contemplating the removal of the catalytic converter on a road going Mini should check their local regulations before doing so; for example on Minis in the UK facing the annual MOT test it may be possible to delete the catalytic converter on the earlier carburetter models, but it certainly isn't on injection models.
         
The exhaust systems listed are mild steel, as available from the manufacturer.  Most are available alternatively in stainless steel; please contact us for details.
         
Freeflow Manifold       
The original direct replacement for original 1961-71 Cooper and Cooper S manifolds, the Freeflow design may be fitted to any road-use Mini but is most ideally suited for engines below 1275cc.  It is shorter than the LCB designs and therefore there's no risk of hitting the centre tunnel on the floor. 
Ill. No. Part No. Description Qty. Rqd. Remarks
1 LM001 MANIFOLD ASSEMBLY, 'Freeflow' 1 With 1 3/4" outlet ext. dia., 1 5/8" int. dia.
2 EXCL03 BRACKET, steady, manifold to gearbox 1 Included in manifold assembly.
3 L71 ADAPTOR PIPE, manifold to front pipe 1 Bridges gap between manifold and Maniflow or RC40 systems.
         
LCB Manifolds      
The long centre branch (LCB) manifold is generally regarded as the most efficient Mini manifold.  Standard bore assemblies are usually for road going cars, whereas the large bore assembly is really for use on competition cars and very large capacity engines only.  The Stage II manifold is derived from the types used on Mini Miglia and historic competition cars.
Ill. No. Part No. Description Qty. Rqd. Remarks
4 LM004 MANIFOLD ASSEMBLY, LCB, standard bore 1 With 1 7/8" outlet ext. dia., 1 3/4" int. dia. Not catalyst fitment; without sensor boss.
  LM004I MANIFOLD ASSEMBLY, LCB, standard bore 1 With 1 7/8" outlet ext. dia., 1 3/4" int. dia. For catalyst fitment; with sensor boss.
  LM004SIIR MANIFOLD ASSEMBLY, LCB, Stage II, standard bore 1 With 1 7/8" outlet ext. dia., 1 3/4" int. dia.
  LM005 MANIFOLD ASSEMBLY, LCB, large bore 1 With 2" outlet ext. dia., 1 7/8" int. dia.
5 L61 Y PIECE, standard bore 1 Included in standard bore LCB manifold assemblies.
6 EXCL01 CLAMP AND BRACKET, manifold to gearbox 1 Included in LCB manifold assemblies.
7 EXCL02 CLAMP, manifold to Y piece 2 Included in LCB manifold assemblies.
  EXCL04 CLAMP, special, flat, Y piece to exhaust system 1  
         
Catalyst equipped Minis will additionally require a special ball-jointed link pipe to be fitted between the LCB manifold and the catalytic converter:
Ill. No. Part No. Description Qty. Rqd. Remarks
8 EX001 LINK PIPE, LCB manifold to catalytic converter 1 With 1 3/4" pipe ext. dia.
         
Downpipes       
If you wish to retain your original cast iron manifold but would like to install a Maniflow or RC40 exhaust system, you will need a downpipe to fit between the two.  All downpipes have a 1 7/8" outlet ext. dia., 1 3/4" int. dia.  Note that the HIF carb type downpipe LD068C has no oxygen sensor boss and therefore assumes that you are deleting the catalytic converter from your car; it may be specially ordered with the boss if required.
Ill. No. Part No. Description Qty. Rqd. Remarks
9 LDP1 DOWNPIPE, single outlet cast manifold to system  1 For HS2 and HS4 carburetter type manifolds.
10 LD068C DOWNPIPE, twin outlet cast manifold to system  1 For HIF carburetter type manifolds; without sensor boss.
11 LD068I DOWNPIPE, twin outlet cast manifold to system  1 For injection type manifolds; with sensor boss.
         
As with the LCB manifolds above, catalyst Minis will require a special ball-jointed link pipe to be fitted between the downpipe and the catalytic converter: 
Ill. No. Part No. Description Qty. Rqd. Remarks
12 EX001 LINK PIPE, downpipe to catalytic converter 1 With 1 3/4" pipe ext. dia.
         
Exhaust Systems      
Saloon Without Catalytic Converter    
These systems will couple up directly to an LCB manifold or one of the aforementioned downpipes (or the Freeflow manifold, with its adaptor pipe) There is a choice of exhaust systems for pre-1992 or 1992 on models; pre-1992 versions are for cars using square block intermediate and 'bobbin' rear rubber mountings, whereas 1992 on versions include rods for the oval rubber mountings fitted to cars from that date.
All systems have a 1 3/4" pipe ext. dia.    
Ill. No. Part No. Description Qty. Rqd. Remarks
13 LS001A EXHAUST SYSTEM, Maniflow, single box, side exit 1 For pre-1992 exhaust mountings.
  LS001AI EXHAUST SYSTEM, Maniflow, single box, side exit 1 For 1992 on exhaust mountings.
14 LST001A EXHAUST SYSTEM, Maniflow, twin box, side exit 1 For pre-1992 exhaust mountings.
  LST001AI EXHAUST SYSTEM, Maniflow, twin box, side exit 1 For 1992 on exhaust mountings.
15 LS001B EXHAUST SYSTEM, Maniflow, single box, centre exit 1 For pre-1992 exhaust mountings.
  LS001BI EXHAUST SYSTEM, Maniflow, single box, centre exit 1 For 1992 on exhaust mountings.
16 LST001B EXHAUST SYSTEM, Maniflow, twin box, centre exit 1 For pre-1992 exhaust mountings.
  LST001BI EXHAUST SYSTEM, Maniflow, twin box, centre exit 1 For 1992 on exhaust mountings.
17 FP001 FRONT PIPE, side exit, without resonator 1 Included in LS001A and LS001AI single box systems.
18 FP003 FRONT PIPE, side exit, with resonator 1 Included in LST001A and LST001AI twin box systems.
19 FP002 FRONT PIPE, centre exit, without resonator 1 Included in LS001B and LS001BI single box systems.
20 FP004 FRONT PIPE, centre exit, with resonator 1 Included in LST001B and LST001BI twin box systems.
21 LRHOL REAR BOX AND TAIL PIPE, side exit 1 Included in LS001A and LST001A systems.
  LRH01AI REAR BOX AND TAIL PIPE, side exit 1 Included in LS001AI and LST001AI systems.
         
Exhaust Systems      
Saloon With Catalytic Converter    
These systems are designed to couple up to a Mini catalytic converter, or the specially designed catalytic converter replacement pipe (also listed here). There is a choice of exhaust systems for pre-1992 or 1992 on models; pre-1992 versions are for cars using square block intermediate and 'bobbin' rear rubber mountings, whereas 1992 on versions include rods for the oval rubber mountings fitted to cars from that date.
All systems have a 1 3/4" pipe ext. dia.    
Ill. No. Part No. Description Qty. Rqd. Remarks
22 LS003C EXHAUST SYSTEM, Maniflow, single box, side exit 1 For pre-1992 exhaust mountings.
23 LS003AI EXHAUST SYSTEM, Maniflow, single box, side exit 1 For 1992 on exhaust mountings.
24 LST003C EXHAUST SYSTEM, Maniflow, twin box, side exit 1 For pre-1992 exhaust mountings.
25 LST003AI EXHAUST SYSTEM, Maniflow, twin box, side exit 1 For 1992 on exhaust mountings.
26 FP005 PIPE, catalyst to rear box, without resonator 1 Included in LS003C single box system.
27 FP006 PIPE, catalyst to rear box, without resonator 1 Included in LS003AI single box system.
28 FP007 PIPE, catalyst to rear box, with resonator 1 Included in LST003C twin box system.
29 FP008 PIPE, catalyst to rear box, with resonator 1 Included in LST003AI twin box system.
30 LRHOL REAR BOX AND TAIL PIPE, side exit 1 Included in LS003C and LST003C systems.
31 LRH01AI REAR BOX AND TAIL PIPE, side exit 1 Included in LS003AI and LST003AI systems.
         
The catalytic converter replacement pipe allows deletion of the catalytic converter without any modifications to the rest of the exhaust system:
Ill. No. Part No. Description Qty. Rqd. Remarks
32 EX002 REPLACEMENT PIPE, catalytic converter 1 See note on regulations in the introduction for this section!
         
Exhaust Systems      
Saloon 'Works' System      
This one's rather special - made for Somerford Mini by the original supplier to Special Tuning, it is a faithful reproduction of the later oval-ended rear box type (the earlier crimp-ended box can no longer be made) exhaust system fitted to the all-conquering Minis campaigned by the BMC/BL Competitions Department in the 1960s and 70s.
         
Much beloved by the Historic Racing fraternity because of its originality, it includes two resonators followed by a large rear box and upswept centre tail pipe. The system fits very closely indeed to the car body and is completely flat underneath: there's nothing to get knocked off because the pipes are flush to the undersides of the resonators and rear box.
Ill. No. Part No. Description Qty. Rqd. Remarks
33 STR807 EXHAUST SYSTEM, 'Works' 1 With 1 3/4" pipe ext. dia.
         
Exhaust Systems      
Traveller, Clubman Estate, Van and Pick Up     
A choice of single or twin box systems have been developed by Maniflow specifically for the longer wheelbase Minis; both are of the side exit type and both have a 1 3/4" pipe ext. dia.
Ill. No. Part No. Description Qty. Rqd. Remarks
34 MANSBV EXHAUST SYSTEM, Maniflow, single box 1  
35 MANTBV EXHAUST SYSTEM, Maniflow, twin box 1  
         
RC40 Exhaust Systems    
Saloon Only      
The best known road-use exhaust systems amongst Mini enthusiasts, the classic RC40 design comes in twin or single box configurations to fit non-catalyst or catalyst equipped Mini saloons (note that RC40 systems do not fit Traveller, Clubman Estate, Van or Pick Up models).  The external pipe diameter of the RC40 is 1 3/4".  All listed boxes and tail pipes mount to the car using the pre-1992 rubber block intermediate mounting and 'bobbin' type rubber rear mounting. 
         
The RC40 twin box system very closely resembles the original Cooper, Cooper S and 1275 GT systems and as such makes a very appropriate, easy to fit alternative for those models.
         
The single box and twin box RC40 systems listed here will fit onto a Freeflow or standard bore LCB manifold, or one of the downpipes listed above.  However, note that depending on which manifold or downpipe is used, the coupling sleeve on the end of the RC40 front pipe may have to be trimmed off to fit.  The catalytic converter on Minis so equipped would be deleted if using either of these two complete systems - please check your local regulations for road use of a car with the catalyst removed.
Ill. No. Part No. Description Qty. Rqd. Remarks
36 RC40SBS EXHAUST SYSTEM, RC40, single box 1  
37 RC40TB EXHAUST SYSTEM, RC40, twin box 1  
         
Front pipes for the RC40 come in three types: long front pipe for single box systems (including cars where the catalytic converter is to be deleted), short front pipe for twin box systems and a catalyst link pipe for single box systems where the catalyst is to be retained: 
Ill. No. Part No. Description Qty. Rqd. Remarks
38 RC40FPSB FRONT PIPE, long, single box system 1  
39 RC40FPTB FRONT PIPE, short, twin box system 1  
40 RC40CP LINK PIPE, catalyst, single box system 1  
         
The rear box and tail pipe used with the link pipe for catalyst cars may also be used as a replacement rear box for non-catalyst cars with the single box system:
Ill. No. Part No. Description Qty. Rqd. Remarks
41 RC40RB REAR BOX AND TAIL PIPE, RC40 1  
         
Exhaust System Fittings    
For manifold or downpipe gaskets and fixings, plus catalytic converter gaskets and fixings, please see the standard exhaust systems sections.
Ill. No. Part No. Description Qty. Rqd. Remarks
42 GEX9008 CLAMP, U bolt type, 1 7/8" A/R  
43 GEX9009 CLAMP, U bolt type, 2" A/R  
44 GEX9010 CLAMP, U bolt type, 2 1/8" A/R  
         
Making life easier, the pre-1992 style intermediate rubber mounting, both rear rubber mountings, both mounting brackets and four clamps for the exhaust systems listed above may all be ordered together as a fitting kit.  This kit will also work on Cooper S and 1275 GT standard exhaust systems, so long as you don't mind U bolt type clamps instead of the original wire clamps fitted to those models:
Ill. No. Part No. Description Qty. Rqd. Remarks
45 RC40FK FITTING KIT, uprated exhaust systems 1  
46 GEX7081 MOUNTING, intermediate 1 Included in fitting kit.
47 GEX7248 BRACKET, exhaust system to mounting 1 Included in fitting kit.
48 GEX7251 MOUNTING, rear 2 Included in fitting kit.
49 GEX7249 BRACKET, exhaust system to mountings 1 Included in fitting kit.
50 HCS130 CLIP, exhaust system to brackets 2 Original Cooper, S and 1275 GT clip; not included in kit.
         
1992 on systems are rather simpler, requiring only two oval rubber mountings to hang them on the car:
Ill. No. Part No. Description Qty. Rqd. Remarks
51 GEX7661 MOUNTING, rubber, exhaust 2  
         
And finally, for those who like to 'mix and match' their exhaust components, we can offer these useful straight lengths of pipe:
Ill. No. Part No. Description Qty. Rqd. Remarks
52 ET44 EXHAUST PIPE, straight, 1 3/4" ext. dia. A/R Sold per metre.
  ET48 EXHAUST PIPE, straight, 1 7/8" ext. dia. A/R Sold per metre.
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Part No: RC40SBS
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Part No: MANSBV
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