Key takeaways Tell your insurer about a remap before you tune, not after. Which? lists ECU modifications among the engine changes insurers expect to hear about, and staying quiet could invalidate your policy. Your premium might rise, or it might not. Performance changes tend to cost the most. Specialist insurers, independent brokers and owners' clubs can help if mainstream quotes are poor. Many owners focus on what a remap does to the car and forget to ask what it does to the insurance. In the UK that can be an expensive mistake. This guide explains what to declare, what can happen if you do not, and how to find sensible cover, using advice from the consumer organisation Which?. Why you must tell your insurer The Which? guide to modified car insurance says you should tell your insurer about any modification, and that insurers can class more things as modifications than you might expect. It lists engine and mechanical changes, including ECU modifications, among them. A remap change...
Chiptuning and ECU remap guides: how it works, what you can gain, the risks and how to choose a good tuner.