welcome to the forums.You are not allowed to have fender vents unless you spend a lot more money on a car that already includes them.
It is unfair to buyers of luxury models to add the same design elements that differentiate themselves from any of us lowly Hyundai owners. Cadillac, BMW, Jaguar, Mercedes, Kia Optima, Infiniti, Aston Martin, etc. Sure, the vents on these luxury cars are either not functional or not required with today's technology, but that is not the point.
This also applies to any other modifications of course - hopefully everyone here still has their stock rims with the manufacturer's original OEM diameter.
Take off the side fender vents and always allow luxury cars to pass you on the road.