The guys at Broadway Performance just changed my pulley and reprogrammed my ECU on my '13 XKR....What a difference!! I can't explain how fast the car pulls now and the amazing torque...got about 610 HP now!!
Next...I gotta change my rear spoiler and maybe a Mina Exhaust...the Active Exhaust still doesn't do it for me.
Glad to have found the ideal shop for my Jag...these guys are expert and they know so much about Jag cars..Also saw the latest F-Type in orange that they are renting out...hmm! Ask for John when you call them...tell him you are a friend of Mo with the white jag2013 that got the pulley..he will take care of you.

 

Hello Samy, where is Broadway Performance located and does the modification void our warranty? thanks

 

Some Jaguar dealers do the same work; not sure if it is backed by the manufacturer, but I'd think the dealership would stand behind you should an issue arise.

 

They are in New Jersey...Call John at 973-779-8405 and tell him Mo with white XKR 2013 referred you.
They are a lot of cars from out of state.
Best of luck...let us know it goes.