Obviously I haven't driven a 5efe Starlet, but can say that going up from the 4efe to the 5efe (Starlet to Paseo) it is a really nice difference. The extra torque makes the car pretty effortless to drive around town (can be doing 30mph at 1500-1750 rpm depending on gear) and is far smoother in feel to the 4efe (due to the less revvy nature it seems less thrashy) with slightly better performance. However, you'll feel more of a gain, as the Paseo I drive is obviously heavier than a Starlet (is 100-200kg heavier I think?) I would recommend the 5efe swap, for simplicity, driveabilty and insuranc