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thicknessess that can be welded (>2-3mm, ~0.1"), and there would be a severe learning curve for the every day welder to learn how to properly TIG/MIG weld aluminum components, filler wire differences, weld settings, etc. Cost, reliability, scrap rate (cost), material cost (cost again) are disadvantages that overshadow designers desire to save a few #s... thermodynamics drive aluminum to the oxide immediately, and that forms (aluminum oxide/ceramic) which does not weld without further challenges. A ceramic or ceramic-lined exhaust would be just as light as aluminum, but again, is at the brunt of the cost whip. SS
____________________________________________________________________________________________________ "You have nothing without your health." Lou Guazzelli, whose time is of the essence. Prayers with you, Uncle Lou. In the end, the only thing we regret, are the chances we never took. My promise:
I will obey the rules of the road. I will not drive like I'm delivering an organ. I will not purposely scare cows. I will not make light of gravity; and I will recognize the speed limits as strict law, and not just ballpark suggestions. Yeah, right! 
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