I would not bother, the BOSE "premium" sound in the leaf sounds very poor imo. You'd be far better off upgrading with proper speakers and proper amplified sub. The Sub in the Leaf is ridiculously underpowered and creates a boom and actually destroys the audio quality. And still has a lack of proper baas. It Doesn't get remotely close to the base depth and loudness of a proper Sub, naturally given it's tiny size.