This Evo IX is my first turbo car. Can someone enlighten me as to what the twin-scroll turbo means? Obviously I know what a turbo is, but what does "twin-scroll" mean?

Also, does everyone use the Gravel setting on the ACD in rainy weather or just keep it on tarmac? It feels like it is easier to start off on an uphill with the ACD in Gravel or even Snow setting for some reason, but I don't know exactly how this works, or if that is detrimental to the drivetrain. Any comments on this?

Thanks in advance for the help and advice...

 

i live in texas and have never switched the acd to gravel or snow : ( sorry kinda wish i live somewhere i cane use snow though