I wanted to bring this topic up, now that quite a few modified Minis are now on the road. I don't want this to be a JCW bashing or someone saying do a search for older posts.

With the big discussions surrounding the "extra peace of mind" that the JCW warranty provides being a strong consideration in the purchase of the JCW kit, and the fact that there are now a lot of people out there with similiar mods with well over 36,000 miles, I would like to solicit some information.

Has anyone had warranty work denied by BMW directly attributable to an aftermarket ECU chip upgrade, a 15% pulley upgrade (only 15% not 17% or 19%), an aftermarket exhaust or upgraded spark plugs. I don't think there is a lot of individuals out there with ported and polished heads to gather feedback from. These are the core components of the JCW kit, so I would like to find out if there are any failures to your car related to these parts and whether they were refused coverage because of this failure. At this point, I believe Randy and Helix (the vast majority of installers for the pulley) have never heard of a single problem with the 15% pulley. It would be very curious to see if anyone has any problems.

With more and more people gathering these mods and the longer these mods are on the cars, the more history the Mini community has.

 

So far in Hawaii, there are no warranty issues with any of those upgrades and the dealership.
There are also no problems with those upgrades that I know of whatsoever in any MCS or MC in my area.
The JCW kit MCS cars are all doing well.