SwedeSpeed is a better resource for such things:
https://forums.swedespeed.com/showthread.php?601249-Accessories-Coupon&highlight=accessory+coupon
As someone who had a GTI and a WRX before this, I’m as familiar with chipping as the average Internet troll. Obviously all those Stage I software tunes that can be rolled-back are what they are, and a couple brands actually have checksums on your ECU to ensure it hasn’t been tampered with (so chipping is now as much refreshing the ECU as it is being able to flash it back). Feel free to peruse your favorite brand’s message board about tunes that caused problems and were not covered under warranty.
Volvo owns Polestar, it’s a first-party Stage I tune, it and any side effects are covered under Volvo warranty. It allegedly has no impact on gas mileage, just torque and HP (I posted the details in an older on thread on this).
Is that the same thread where I fact-checked as false?
It’s like putting a sticker on a Civic: the decal adds 30HP