30mm much more fan i use.
i took out the washers and screwed it straight to the heatsink as it was a squeeze in the ZX5.
I also wired it to the 7.2v of the speedo for extra air shifting in the 4wd. In the B4 it should be fine off the standard BEC.
some people run the 25mm fan in 2wd and mill out the heatsink slighty so the fan sits semi-inside the heatsink so it fits under low shells.
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