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I know aluminium cant really take the high temps of a downpipe/manifold and elbow, but would u be able to make a cat back out of it??

if its the heat issue, would ceramic coating the whole thing help??

has this ever been done, or is it impossible???
 

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acting daft since 1969
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theres a FATIGUE thing as well ,plus to be stong enough to take a knock every now and agian it would be to thick compared to a stainless system ,which wont weigh that much more
 

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It has been done successfully many times in the states. Incredibly light but costs similar to stainless exhausts. I wouldn't use it on a daily driver but if you only use it on the track then should be fine.
 

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Even at the temps the downpipe gets to?

It has been done successfully many times in the states. Incredibly light but costs similar to stainless exhausts. I wouldn't use it on a daily driver but if you only use it on the track then should be fine.
 

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acting daft since 1969
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NICE clicky there grayw ,but im more inclined to get it power increase due to the design of the manifold than the stuff its made out of

my old MG rally car engine ran a 4-2-1 manifold of a better design than standard , i the swopped it for a really trick genuine S1600 manifold from a works car it gave 15 bhp differance ,it was heat wrapped which i removed it made no differance to the power curve at all
 

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Transmission Dynamics
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Anodizing has it's limitations, just like any other form of corrosion protection. Protecting the inside using an anodized finish would be difficult, as this is where most exhaust corrode through from.
Anodising an exhaust inside and out is very easy and extremely effective. In fact even in unprotected form, alloy tends to form a coat of oxide on it's surface which protects against corrosion. It's much less likely to corrode than steel, and that's what most exhausts are made of.
 

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In that case, why are they not being manufactured?

Anodising an exhaust inside and out is very easy and extremely effective. In fact even in unprotected form, alloy tends to form a coat of oxide on it's surface which protects against corrosion. It's much less likely to corrode than steel, and that's what most exhausts are made of.
 

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Transmission Dynamics
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In that case, why are they not being manufactured?
Many people use aluminium exhausts, but it is a specialised market.

Oh and BTW, a lot of steel exhausts are Aluminized, ie a coating of aluminium add to the surface of the steel to help protect against corrosion.

The exhaust below is aluminium straight from the turbo.
 

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Very specialised market, apart from the motorcycle world. What happed when the one above was run, as you can see it's never been started from those pics.
 

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Transmission Dynamics
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I suggest you read the OP's orginal post, he asked "would u be able to make a cat back out of it??"

Yes.

"has this ever been done, or is it impossible???"

Yes.

I and other people I know have used aluminium exhausts, with good results, fact.
 
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