Frankly I find the audio in this car is the least important part of the whole experience. I have the Sound Package Plus, which is weak. But I'd spend money on BiXenon, sport shifter, even chrome exhaust tip before I'd upgrade to the Bose. Personally, I'd drive it for a few weeks and decide how much more audio you really need. I enjoy driving it enough that a lot of the time the stereo is off completely.

Once I hear an example of the PSE for the 987, that might be my next audio upgrade!

mcdelaug