Better safe than sorry is the phrase that pays right?
You're talking 5 minutes of time and what, five bolts?
I'd make her 100% stock as purchased if I was taking her back for first service.
Ground wire and gytr tip.
When you pick bike back up, AFTER you've paid for service, ask them if the GYTR insert would be an issue with the warranty and see what they say.
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2008 WR250X
Gearing: 13t - 48t
Power Commander 5 / PC-V
Airbox Door Removed - Flapper glued - AIS removed
FmF Q4
Bridgestone Battlax BT-003rs