I used 12 guage steel. Just under 1/8th inch thick.
I'd think aluminum would be nice in about 10 guage. 12 seems a bit thin for alum.
How do you plan to make the bend in it? If you have access to a welder set up for aluminum, it's easy. Just score the bend line with a grinder, bend it, and fill the void with weld.
Question though. Aluminum is a much better metal for transfering heat than steel is. Are you concerned about turbo heat? Not sure if it'll make much difference.
Post pics when you finish it!
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