Actually City IDSI sy pehly City my doosra engine hota (Before 2004~3 Model), City IDSI is different engine. This is 1300CC engine which is built for considering fuel economy in mind,not the power like VTI or VTec engine.
So, that's the reason why I specifically mentioned IDSI. Baqi Crollor my Sirf VVTI hi aata hy (I guess) they are not like Honda VTI,VTEC,IDSI, IVTEC aur pata ni kia kia bana rehy hy honda waly.