yes all rb engines are 6 cyl,i would go for the 2.5,you might be able to make the 2.0 rev higher but the extra capacity of the 2.5 will win out in the end
go for the 2.5 mate i started of with the RB20DE was chuffed sold that got a RB25DE and the difference was amazing also not that much difference in fuel costs to be honest
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