turbo/blow off valve sounds - “stututu” sound for r34 and “woooo-tssss” sound

But I had a problem I think everyone will have or already had: turbo sounds dont change instantly after installation, you have to install it at a workshop and enter your garage... I think by the time you're in it, the game does a save and updates your cars. You can just get out of the garage without touching your car (just enter and exit the garage, as simply as that) and it should update the turbo sounds.