cheers guys that's pretty useful stuff.
Dan when you say speedo on it's side do you mean as in standing up on it's edge, or just side on to the fan so the air blows through the fins?
i like bradders solution! i have a 25mm fan, and the old man has a milling machine
do you reckon this would also work in the 4wd if the 25mm fan was wired to 7.2 volts? i've just had a new shell painted and i don't want to have to get an Arahzi(?) shell with big scoops and beg my friend to paint that as well!!
lastly, what overall gear ratios are you guys running (the X6 has the same ration as the B4?)