You can remove the hose that connects the factory bypass valve and the intake, so the bypass valve vents to the atmosphere giving you a similar sound. Just make sure you cap the port on the intake, a 7/8" rubber chair leg cap will work fine.i had my car parked in Philadelphia at my cousins house. And my cousins neighbor said hey man is that a 1.6 turbo man. i said yup it is just bought it. he said he has a veloster with apparently same engine and he said it would get a blow off valve sound without having a blow off valve.