I've read some topics but most are filled with personal preferences.

for my stock 225ci slant six from 1964, what was the original size exhaust? I cannot seem to find it anywhere so I need someone to make one for me.
i've read people install 2.25" exhaust all the way from front to bumper, but also 1 7/8"diameter?

from what https://www.slantsix.org/forum/viewtopic.php?t=56328 this is saying it should be;

from manifold 2 1/4" untill the muffler, and 2" going onwards to the rear.
I don't want extra noise, I just want it stock.

has anyone the right answer for me? thanks in advance.

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Renault 5 '84, '64 Dart GT Convertible

Original was either 1 3/4" or 1 7/8", I am pretty sure. The larger sizes give you just a few more HP, and can be made perfectly quiet with a normal (non performance) muffler. 2" is plenty for any stock engine. The smaller stock sizes were used from the factory for cost savings.

Best of luck!
Lou

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Home of Slant6-powered fun machines since 1988

Feather Dusters and Dart Lites used a 2.25 head pipe into a V8 muffler.
The muffler was 2.25 in and 2 out.
This was chosen for fuel economy.

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Hyper_pak

48mm headpipe, 45mm tailpipe. Barely adequate; specified with priority on low build cost. For optimal driveability and fuel economy without noise, do like this, would be my reco.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

Arrgh gotta be metric .... And I was just saying how good it felt to be able to work on my fury and not needing a single metric tool on it this past weekend

Dan is talking to someone from The Netherlands. The entire rest of the world (95% of the earth's population) uses metric measurements. Likely easier for him to understand it and ask for parts there... 48 mm X (1/25.4 mm) = 1.88" = 1 7/8".

Thanks,
Lou

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Home of Slant6-powered fun machines since 1988

I actually prefer the metric system when doing construction projects. It is so much easier to split/add numbers in MM instead of fractions. After enough years of working on metric cars it actually feels weird using SAE tools. At least I don't have any british wentworth tools or the need for them.

To clarify: the "recipe" I linked to is a reference for pipe sizes and muffler choices – I don't mean to suggest Dutch should install dual manifolds or anything like that.

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一期一会
Too many people who were born on third base actually believe they've hit a triple.

I really appreciated it; I have indeed bought un-metric tools and always have to change from inches to cm...
(it gets even harder when you guyes talk about torque, pounds and quarts... Even the gallon could be UK gallon or US gallon and don't even get me on the UK weight in stones...)

But please continue in inches and feet... I will do my maths while reading along.

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Renault 5 '84, '64 Dart GT Convertible

no I won't, thanks for your link. I will stay with the single exhaust. But that'll be at the end of summer or next winter-project.

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Renault 5 '84, '64 Dart GT Convertible