Failing to declare a remap voids your insurance. Declaring it the wrong way doubles your premium. Here's the right way to do both.
Insurers that handle remaps well
Adrian Flux, A-Plan, Sky Insurance, Greenlight and Performance Direct all underwrite modified cars sensibly. Mainstream insurers like Direct Line / Aviva often double the premium or refuse cover.
What to say
'ECU remap, Stage 1, [+X bhp], non-cosmetic'. Don't volunteer extra detail. Don't lie. Don't undersell — under-declared mods void claims too.
Get the tuner's spec sheet
We provide a full written specification with peak power, torque, and the fact the map is reversible. Insurers love documentation — it makes underwriting straightforward.
Common mistake
People declare 'engine modified' with no detail. That triggers a big load. Specific declarations (Stage 1, +30bhp) almost always cost less than vague ones.
Related services on StageMyCar: Stage 1 remap and Harrow ECU remapping.