I would steer way clear of this one. Speaking from experience, I would never buy a known modded car of this caliper. Way too many things to go wrong under normal conditions. If the car was modded, driven hard and put up for sale, I don't see the advantage unless this was a super bargain price. I would put no faith in the "warranty" as there are many posts about Dinan and warranty issues. The dealer is out to make MONEY. Both selling and servicing. I think you will get burned down the road. If this is your first BMW, I would say go stock, low miles and CPO if you can. Even having warranty work can be a pain, especialy when it has to keep going back because it's not fixed correctly. Not all repairs are rectified on the first trip. If they can squeak out of the warranty end of it, you can end up paying mega bucks and still be stuck owning a car that you may be affraid to drive because of the costs to drive.