B&M Shiftplus
 

I was looking at installing a B&M electronic shiftplus on my 98 3.8 with an auto. B&M claims that it doesn't void the warranty but ford claims it does. I recieved an email from B&M explaining why, but I'm not sure it will be enough. Has anyone installed one, and dealt with the dealership over the warranty that could give me some tips? Or if anyone out there works for a dealership and could let me know if B&M is right or Ford.