Took the opportunity of asking about this issue when I ordered my new Cooper on Saturday. The sales guy was very impressed by my knowledge of the car (all form this website - thanks) and so was very honest but "off the record". He reckons that you get away with an induction kit and an exhaust as long as the rear of the car remains the same. He also said that in his opinion a superchip would be looked over during services if fitted. The dealership I went to seemed to be quite happy with mods as long as they are not painfully obvious. Looking at some of the larger BMW's in the lot that the mechanics had been playing with it wasn't a surprise.
He implied that as long as the exhaust appears from the same place as you look at the rear of the car then you can change anything between that and the engine. I guess he also meant that the exhaust had to look the same ie same diameter and chrome design. I hope that is clearer.
I got in contact with the Sytner Dealership Grp and got this response;
I have spoken with one of our Mini Specialist at our Sytner Leicester Dealership and she has told me that if the exhaust you wish to fit is not an approved Mini part, then if you have a problem with the exhaust or any other problems that are caused by the exhaust these will not be covered by your warranty. If the part is an approved Mini part that is fitted by an approved Mini dealership then your warranty is not affected at all.
I strongly advise that you visit your nearest approved Mini dealership and speak to the technicians in the service department before any work is carried out on your car.
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