they want money ma....so they tell u to do this do that...when kong & claim warranty, all buat x tau....so my suggestion is just keep your car as n/a....no point having BOT but give u ciput hp only...unless u wanna convert to YRV turbo, then its a whole different story.......that day i go few shops and ask already... those mech ask us to do on bolt some ask us to add on supercharg... the mech tell us depens on luck if u take the YRV engine no problem but dont mean the problem wont apper 1 or 2 month or longer...
sometimes i c some myvi's (just came out from DPro) kepish here kepish there (u can c whether its a turbo engine or BOT)....but the speed like normal car only....i think my kancil also faster then them