Well you can fit better (stronger) internal parts and this is always a good idea, but the main reason for the stroker is more torque and power. You get more torque out of a 6 cylinder like the RB series, but IMO it is easier to modify an engine that is fitted, than try to modify a car to fit a different engine. I have been there are done that, never again. That's why I bought the 200SX (Silvia). Easy to modify for extra power.