For no reason other than I like the look of them, I'm interested whether anyone has put drilled or slotted rotors on the 2011 model XKR, and whether they knock around the warranty. I know it is a bit of a toss and appreciate the shortcomings, but I've had them on other cars and I like the look.

 

Why would you think they would mess with the warranty? Not possible unless you try to get them to cover pads (which will wear faster) or broke something putting them on.

FWIW Go slotted not drilled. Not as cool looking but a much better disc over all. I'm running Stop Tech Slotted/Cryo...

 

Installing the slotted or drilled rotors should not "void" any warranty as brake systems like pads and rotors are considered a wear and tear item. Warranties don't cover wear and tear items such as these. At least I am not aware of any automobile constructor that will warranty these items.

I also suggest and agree with the above, go slotted rotors.

Keep us posted on how you make out and what you choose.