now i must disagree when it come to the k series. i have owned a ke30 with a 3k then converted to 4k coz i blew up the 3k lol but for toughness the k and datsun a series would be pretty even but when it comes to power the datsun motor wins hands down ... i have no idea why but when you drive a 3k compared to an a12 you too would agree that the datsun motor is much better. but when it comes to buying parts the rolla wins because there no demand for them lol