Why no aluminum???
 

If everyone is so concerned about weight savings why doesn't anyone try making an aluminum catback single exit exhaust? i can only imagine it weighing a couple pounds. I plan on having one custom made to bolt up to the AP headers here in the next month. I think a mass produced version would sell great.

because metallurgy

Here you go: http://www.lmgtfy.com/?q=why+isn%27t...d+for+exhausts

Aluminum is not that easy to weld.

aluminum is very easy to weld and I've used it for exhaust before. someone should probably tell STM or Full-race they're wrong for using aluminum exhausts on their 9 sec+ race cars then....

Closed before this goes downhill, but did you read anything from the link I posted?

Using Aluminum on a race car doesn't mean anything. It will get brittle very quickly and it will break, that doesn't matter on a race car, it matters on a street car.

Decided to re-open, but will shut it down again if it goes too far.

In before thread is closed and re-opened again.

If you are concerned with weight savings in your exhaust system, you will want to wait for titanium systems to become available.

My GD Magnaflow Ti catback could be held up by one pinky finger.

epson,

Yes, AL exhausts are used in racing cars, that are under different situations than your everday DD.

Long story short--stainless steel strikes the best compromise between wear and weight. Aluminum is light, but would be worn out (for various reasons) after a relatively short time.

Ask Geoff from full race how well that exhaust worked out for him when his s14 w/R32 conversion caught fire because it blew a hole in the exhaust due to the ductability of Al at those temps


to the OP:

For future reference when asking why not, consider answers, consider source, before making yourself seem...over extended in your knowledge base

I wasn't going to mention the fire :P

My bad :(

There are a couple of Ti catbacks out from the JDM companies but they are super expensive. Freed Engineering is/was working on a single exit catback which weighs in the neighborhood of 10lbs.

I wish Magnaflow would make a single exist Ti catback for this car (I had a GD one as well) but I think they got out of making them a long time ago. I still have mine I was going to see if there was some way I could shorten it to make it work on the BRZ. :D