Interesting idea and kudos for the R&D. This would be great weight savings for a heavily tracked car that wants to keep some street-ability with respect to noise. The welds fatiguing out over time would be my only concern (both at the pipe connections and the hangers). Aluminum's strength isn't great at temperature. My stainless exhaust grows quite a bit after some hard driving: the tips protrude out an additional 1/2" or more from their "cold" location. Aluminum will grow even more which could stress the hangers and other weld joints between hangers depending on the configuration...I only see one hangar in the photos but I'm sure you have more. Time will tell but props again for trying something new and bringing more options to our platform.
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