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I always make the leading edge of my track splitters from Marine Ply. Like you say if you track seriously it's a consumable. I make them 2x at a time so I always have a spare/template!
I ground my last one out through making too much downforce at 165mph that it ground away on the tarmac. My latest has survived 150mph+ and several trackdays including Nürburgring (very bumpy).
You might find ABS is a bit brittle (strong but cracks easy)..
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