I haven't been able to drive the car yet with the splitter but this one is made from quarter inch plywood. I am pretty sure it will not hold up to sustained track use but I am going to make another out of Alumalite. It's two aluminum sheets with a corrugated plastic core. It's super strong and can be bought at any sign shop.
https://www.laminatorsinc.com/sign-p...ucts/alumalite