For modified cars, it is important to inform your insurer about the modifications you have made as some insurers are less willing to cover insured cars. It really depends on what you're looking for so it's important to discuss with your insurer to decide what works for you. Also, you need to check whether the modification done on your car is allowed, you can find out more via this link https://www.motorist.sg/article/174/8-vehicle-mods-not-allowed-in-singapore.