Hyundai 2000 Accent Owner's Manual page 5

CAUTION: MODIFICATIONS YOUR HYUNDAI
Modification of components may void the manufacturer's warranty
Your Hyundai should not be modified in any way. Modifications may adversely
affect the safety, durability and performance of your Hyundai. Components
which are subjected to modification or are added to the vehicle resulting in
consequential damage are not covered by the vehicle manufacturers warranty.