[KobaltBlau]

I would like to know whether the factory race cars are using rubber or teflon lines under the stainless. The stainless braid is probably a good idea for cut protection on frequently maintained race cars, but most people feel that if there is a "firmer" feel from the "stainless" lines, it's because most (but not all) of them use a teflon line instead of rubber underneath the SS sheath.

FWIW, I'm using fresh OEM rubber and don't intend to change.