[Takumi788]

My theory is products like this get carried over from one chassis to another through the manufactures desire to sell anything and the consumers knowledge of another chassis. For example. A previous owner of an E36 would think that a sway bar brace is needed on a twin because the E36 rear sway bar mount are prone to bending/tearing.

Also, manufacturers will look at a product that sold well on one chassis, and make it for another not because it solves a problem, but because it sells.

I believe strut tower bars also fall into this territory. A completely useless item on one chassis (the twins already have a triangulated brace to the firewall), helpful one an another (like the disturbingly weak strut towers on an E36).