While talking with the service advisor this morning i asked how i stand regards warranty issues when modifications have been carried out, such as suspension, exhaust systems, engine tuning/remaps etc, he tells me the bmw stance is only the areas that have been changed would the warranty be void, the only grey area would be an engine tune/remap because the information upload would stay on the bmw system even if the tune /remap was removed, so any warranty issues regards the engine would be up for debate/argue/fight. Forewarned forearmed.