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aluminum exhaust system

Old 04-30-2009, 12:12 AM
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nit
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Default aluminum exhaust system

Helo everybody!

Im thinking to make my car exhaust system ( from middle of car to back ) include back box with aluminium... Do you think its a gud idea? The idea behind is to lessen weight and some people told me aluminum box sound greater than stainless steel....?

Plz give your opinion!

Thanx
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Old 04-30-2009, 09:13 PM
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You can do it. I don't think I could advise it for a street car, but I'm sure people have done it. I would discourage hangers that weld to the pipe. That's a long moment arm to put on a welded aluminum joint. My opinion would be that laying the pipe on a steel hammock of sorts covered in rubber would be the best solution, but I've never tried it.

All aluminum exhaust piping - DSM Forums

You can see post #11 for what I would consider a drag only setup.
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Old 05-01-2009, 11:31 PM
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I am not one to discourage doing something 'different,' but what you're talking about is pretty unnecessary especially because a well designed, efficient exhaust shouldn't weigh much- relatively
also worth noting is that the weight of the exhaust isn't such a terrible thing considering it's location

I saved over 25 lbs on my crx by cutting the exhaust off before the rear axle and adding a small section to put the fumes out the side of the car
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Old 05-02-2009, 07:18 AM
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an aluminum exhaust is fine as long as it start at the firewall, and no closer to the engine. there really is no downside other than getting it welded.

also, whoever said that the car will sound better with an aluminum muffler is an idiot. the type of metal wont change the sound of your car.

most of the sound depends on the cylinder size and combustion chamber shape. other things in the exhaust do affect the sound, but not material
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Old 05-02-2009, 08:38 AM
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it will change it slightly, but, not much. I doublt you would reallly notice. If you are going to race the car on more than drag strips, or, do anti lag, I wouldnt do it, it wont last.
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Old 05-03-2009, 05:18 AM
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I run an aluminum exhaust with a stainless downpipe and it's great.

Lighter and cheaper than stainless.

Chances are your muffler(s) will still be stainless, weld the hangers to the mufflers.

looks like this:
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mounted:

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What's the problem?

I made mine from spare chinese 3" intercooler piping pieces I had laying around.

It insulates sound more poorly than stainless though, it seems- the exhaust piping itself seems to transmit more sound waves- so expect a slightler louder and slightly different sounding exhaust, but it's not major.
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Old 05-03-2009, 07:57 AM
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i could see louder due to it being less dense, but i cant imagine it could "change" the sound
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Old 05-03-2009, 12:49 PM
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Originally Posted by EvansPerformance View Post
i could see louder due to it being less dense, but i cant imagine it could "change" the sound
The exhaust system is a big frickin speaker.
Change the speaker material (especially the density like you say) and it will resonate differently.

It's obviously not going to make it sound like a different car, but there is a (minorly) different characteristic to it tonally.
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Old 05-03-2009, 12:55 PM
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you means aluminum 100% or steel aluminized?
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Old 05-03-2009, 04:00 PM
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100% aluminum walter. you can shave quite a few lbs or kilo's where you are from. for a full interior street car, i dont know if its really worth the effort since most people on this site cant weld aluminum, but for a track car, its worth it and if you can weld aluminum then its not any harder than making a steel exhaust.
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