The question of whether a multi billion £ car company can detect if the ecu has been tampered with, & therefore avoid a warranty claim for turbo/engine/clutch etc is pointless.
Accept that they can, and if you have a BMW warranty, modifying the factory settings will put you at risk of it not being honored in the event of a claim.
The possibility of a mechanical failure is quite small, so few examples on the various BMW forums is testament to the build quality, however it is still there.
I was quoted an additional £30 for a remap, never paid more than £60 on previous cars. I can't believe that people who spend £xx,000 + on a car, and further hundreds if not thousands modifying, are suddenly unwilling to inform their insurance company.
Again, the risk of an accident and subsequently the remap being discovered is very small, but still there.
Each of us has to weigh up the "risk vs gain" modifying cars, whether you have the BMW warranty or not.
Personally I have no time for those who give their insurance companies any excuse to void a policy, it is the innocent third party who pays the price, of which my wife has first hand experience.
Last edited by paulathome
on Tue Apr 30, 2013 7:07 am, edited 1 time in total.
BMW 135i M Sport N54, Black, Lemon Boston Interior 2010
Subaru Impreza STi Hatch WRB 2008
Mitsubishi Lancer Ralliart Black 2010
Ford Focus ST Colorado Red 2007
Ford Mondeo ST220 Performance Blue 2005