shopping.... gotta love having KC just around the corner... single or twin box rc40? is a single going to be too loud?

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Here am I sitting in my tin can far above the Moon
Planet Earth is blue and there's nothing I can do...



“A turbo: exhaust gasses go into the turbocharger and spin it, witchcraft happens and you go faster.” - Jeremy Clarkson

Wow, i was working on derby street for about a month, and never even went into karkraft..
I was a stones throw away!

I would get twin RC40's, one on either side.
I'm a sucker for twin exhausts

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You're so square
Baby I don't care

I have a 1275 with head work and a cam and it can get pretty loud with a single muffer............if your driving a long way that drone can get pretty dam irritating!!

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Hi-Ho Silver LS1275
Charlieeeeeeeee Come to Candy Mountain!

Matt,

The older you get (or I get plus several ausmini mates I know) the quieter you want your car to be. I'm pretty sure Doc, GR and Lillee etc have done some engine dyno tests and the benefit you get from running a single RC40 doesn't outweigh the quiet sweet note of a twin box setup.

PS Adam, this isn't a twin exhaust setup; it is two mufflers in series along the same pipe.

When I had mine, I was going to go down the twin box and 1.75 SU route replacing a lukey single and 45DCOE to quieten it down!

But on the flip side - you're only young once and you're going to go deaf at some stage anyhow

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I find the single box RC40 quite OK and acceptable with Cams up to about 265 - 270 deg timing, more than that and a twin box set up to get rid of the resonant bark at certain RPMs. This will depend on your particular engine displacement and head specs too.

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How loud is loud? - half watching one of those 'reality' cop shows last night a young bloke in NSW was pulled over for loud exhaust. At the end of the segment it said on the screen that the limit was" 90dB about the same as a hairdryer" - it would depend how close but does that sound right (forgive the pun)

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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!

I've had a single and a twin box set up on Slidey. Without a doubt I would recommend the single. It's not too loud at all.

I have a twin setup as I found the single RC40 a bit too loud.
I have also found the noise is louder as the exhaust ages.

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1969 Cooper "S"
1967 Mini Deluxe
1973 Clubman Van (the fleet spare)
1978 ex 1275 LS ("Wizard" Eaton Supercharged)
2015 HSV GenF GTS(occasional drive & tow car)
2019 MINI F55 Cooper S

I ran a single box RC40 on the 1360 with a 282 cam, yes it had a bit of a bark. But not excessive.
I now have a 2" system, and the bark is a bit louder.

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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.

The twin RC40 will give you a little more power over the single box and you get to keep your hearing as well . That said, I have the lukey straight through muffler with glass stuffing...loud and you get that lovely "bratt bratt bratt" at idle.

Hooroo

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Rob Forsyth
Miniot!!

single for loud, twin for performance.

In loss I am talking a poofteenth less using the single box vice the twin. I like the lukeys as they are easy to fit and have a turned up exit. I had the twin but it kept breaking the rear mounts. The lukeys never broke

This said though - I have to get my arse into gear and get mine back on the road!!

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Rob Forsyth
Miniot!!

hey a poofteenth more hp on a mini is worth it

a long time ago i had a single straighthrough lukey with centre exit on a smallblock, god did that sound awesome.

single it is!

hell if i get bored of it, ill just add a hot dog to it... (doubt it )

Gotta love KC... cheap cheap cheap

single box, connecting pipe and fitting kit, for $130.... nice!

now the next part... do i weld the bottom of the manifold to the connecting middle pipe or clamp the beh-jesus out of it?

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Here am I sitting in my tin can far above the Moon
Planet Earth is blue and there's nothing I can do...



“A turbo: exhaust gasses go into the turbocharger and spin it, witchcraft happens and you go faster.” - Jeremy Clarkson

how does having having two restrictions equate to having more power than one?