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On another note, I got my custom Motorsport-tech 17mm hub-centric spacers in for the Jaguar.
I'm waiting for my velocity AP springs and ECU tune to come in. I decided to leave the rims color alone.
Can a certified Jaguar mechanic install pulleys and headers without voiding any sort of warranties?
Velocity AP works with an assortment of dealerships that they can honor their work through. While Velocity will warranty their product and any defects as a result of their product, the dealership won't. More importantly, to answer your second question: Jaguar
corporate can void your warranty, not the dealership. When our cars get ECU updates, the dealer's scan tool reads the current firmware, and then the dealer can elect to send diagnostic info of the ECU back to corporate via tool (which is always connected to Jaguar's network). Sometimes, OEMs want the original ECU diagnostics for the sake of data analysis and not to look for any wrong doing - it helps them program future products better.
That said, if your car's ECU is performing perfectly fine, anytime you take your car in for a service (any service) always tell them NOT to update the ECU or TCM. Always. If ain't broke, don't fix it right? If your dealer did the install, they should know this already, anyway and they'll be cool about it. In the event that your car is having some issues and you suspect the ECU is the culprit, flash everything back to stock with Velocity's hand tool, and then take it in.