The sound itself is really nice, but it could definitely do better by adding the lower frequency (bass) sound, be it on the external or onboard, especially on the lower RPMs. Also, it needs the twin-turbo whistle on the lower RPMs too, and maybe some banging transmission sounds for the onboard(?). Overall it's a great sound mod, I really love how close it sounds to real life. It just needs a little bit of the cherry on top. Keep up the great work!