i've told my insurance company about my remap but choose to keep this from my vw dealer. it could save a load of bother one day if they dont know. those who have told the dealer are still at risk of having no warranty cover if something goes wrong regardless of them saying they have no issues with your remap, i wouldn't trust them as far as i could throw them! but it comes back to everyone to their own.they mostly cant be trusted to service your car properly let alone back you up if something goes wrong with your engine or gearbox.