Fitting an RC40 system - what sort of muffler exit should I have?

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David L


My greatest fear in life is that when I die my wife will sell my Mini and tools for the price I told her I paid for them!

Its really a personal choice but i have always been a massive fan of the straight exhaust pip, i have change both exhausts on my minis so they come straight out the centre

Love to have a more scientific reason....but they are just nicer

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Hi-Ho Silver LS1275
Charlieeeeeeeee Come to Candy Mountain!

I love the look for the centre exit but I've heard they tend to suck more fumes into the car, my only experience with one is on my son's car - satan's roller skate - it certainly stinks inside with no sign of an exhaust leak to account for the fumes

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'62 Morris 850 (Marion)
'65 Mini Delux - sleeper 1275/S discs (Ms Plum)
'69 Vanden Plas Princess 1300
'71 Wolseley 1300
'74 Austin 1300 Countryman
'94 XJ6 Sport 3.2
'04 Rover 75 CDTi

I think that has more to do with the length of the pipe, not its absolute position. My car had a stubby outlet which ended underneath the rear beaver panel without protruding beyond the bumper line, and the aerodynamics would suck the exhaust fumes in through the boot and into the cabin.

Now, the pipe is longer and the tip extends beyond the bumper line and it's much better..

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Simon

The adventures of an owner builder in the Tallarook Ranges

I've found in the past that centre exits get cleaned up more on speed humps etc because they invariably hang lower.
Also their fumes tend to hang around the back of the car, can get sucked into boot space (ie the car, there is no seal between) or into the rear side windows when open.
And, if you car is hydro (like all good non-cheapskate Minis are) how you hang the rear muffler bracket will determine if you can connect a hydro pump easily to pump it up.

I like my 2" side exit non-confronting zorst. It draws less attention from Mr Plod.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

haha well mines abit of both sorta?my muffler kinks to the left but then comes straight
out the back hahaha,dont get any fumes in the cabin but a hell of alot of soot on me barn doors!

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1975 clubman panelvan 1152cc

the rwc guy did put a longer tail pipe on and it is a bit better but I still wouldn't like to drive it long distances

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'62 Morris 850 (Marion)
'65 Mini Delux - sleeper 1275/S discs (Ms Plum)
'69 Vanden Plas Princess 1300
'71 Wolseley 1300
'74 Austin 1300 Countryman
'94 XJ6 Sport 3.2
'04 Rover 75 CDTi

side exit

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I've never owned a straight through exhaust (except for a tiny 998 cat's bum exhaust someone decided would look sportier installed straight, so that didn't count ). I've always liked side mounted cos everyone else had them center on their modified minis. Doc also makes a good point about access to hydro valves.

But...
Middle mounted would make it easier to work on the rear radius arms and fuel pump (when installed back there), and there was always something wrong about a muffler situated less than 2 inches from a SU fuel pump and lines...

Are they raspier in note for sticking straight out, or is that an old wives tale?

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

Oh man, what about me? I like both. Take a straight system and put a bend in and it becomes quieter.

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Dean Hutton's first car was a Mini.

I have a center exit 2" exhaust. The speedbumps are not a problem, but make sure your boot and cabin is sealed well.

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Lillee - 1969 Morris Mini K

Wifes daily drive has a 2" Centre Exit and it never been been hit by the speed humps at the local shopping centre. Th front on the other hand is a differant matter. Since the Suspention has been pumped up and the U bold been cut back I have given it a good go over the last couple of days and neather the front or back have hit.

If you Fit the Muffler as close to the Subframe (between the wheels) it want hit and have it as high as you can.

I & the wife have never complain about any fumes entering into the cabin but I can admite the tipe is way past the bumper.

Does sound a lot better then it did when the exhaust was hanging out the wrong side

Center for us

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Stop Licking the Dog...I Don't Care Who Started It

1 7/8 left exit on the hottie in the clubbie so that it clears the tow bar.
2 in left exit under the pass door on a mates racer
1 7/8 left exit in the Fang
twin 2 in exit on the 1800 ute. one each side
2 in right exit hot dog on the ride on mower

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120bhp with 450kg just fun waiting to happen

We were prob. drunk when we set it up last and thought this will be a good idea

I've had all and still have all , sports850 is center , van is side , moke is side and fang is pipe off the end of extractors in the center . I like the look of center so long as the muffler doesn't hang low or the tail pipe doesn't point upwards . Previous mini's have mostly been side exuit as I've had tow bars on them . Would like a pipe out eother side though ....

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centre exit - and watch the flames come down the straight through muffler!

DOZ

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Videos - Turbocharged A-Series on Dyno & at Wakefield
Mafs waz not my strong subgeckt at skkol