Induction options missing

[jelledc]

Hello, i started a new game after a fairly long absence, but when designing an engine i noticed that the induction options have changed. I now can select none (is it the same as NA, or something different?), and all normal turbo's (except level 1 fuel oriented) are missing (only special turbo's like VGT, twinturbo, quadturbo are viewable in the research window... is this a bug? Or is it supposed to make people only use the supercharger?

Thanks