RM 500? Huge savings. Car manufacturers would go for even smaller savings. I've even heard that for example the engines VW produces that go to Audi, VW, Skoda and Seat can be different despite supposedly being the same. The engines that go to Skoda and Seat may have less neat cable arrangements, cheaper cables, maybe higher manufacturing tolerances, or maybe parts that don't pass quality standards for Audi and VW go to Skoda and Seat. etc. Source is someone who IIRC has talked to someone working for VW.

I think he meant Styrofoam material. Cardboard fish tank. hahaha.