If you're daft enough to leave it attached when returning your car to Vauxhall for any problems then they can make a case for 'non-standard parts' being used. Most people will agree that removal of all extra fittings that alter the mechanical running of your car is a wise choice. They simply will not know. More importantly, an induction kit may affect your insurance too. Just be very adept at changing the thing in a short amount of time.
personally i wouldnt bothered with it, yeah they are great after 4000 revs for a lil while, sound brill but they drink fuel as you will soon notice, so ive gone bk to my k&n panel much better performance mate and drinks less fuel, still got my induction kit tho