You are technically supposed to inform the insurance company of any and all upgrades you make, street legal or not. They are insuring the car as it came from th

You are technically supposed to inform the insurance company of any and all upgrades you make, street legal or not. They are insuring the car as it came from the factory, and while most upgrades won't change things substantially, there could be increased wear and tear, for instance, depending on the tune. You may not be legally required to, but the insurance company will pretend the upgrade doesn't exist at best, and actively claim it caused the damage, depending on the upgrade. https://www.valuepenguin.com/special-auto-insurance-coverage-for-car-modifications https://www.valuepenguin.com/special-auto-insurance-coverage... https://www.askadamskutner.com/auto-accident/insurance-for-aftermarket-parts/ https://www.askadamskutner.com/auto-accident/insurance-for-a...