As far as I know obviously you can upgrade to the Litronics without a problem. As for the washer system that is something extra that isnt typically included with the Litronics. At the same point everyone I know that has the washer system is unhappy with them. I didnt bother putting them on. From what I was told the spray from the washer in most cases almost missed the headlight and there is a lot of overspray that ends up getting on the car. So if your car is clean it will make it spotty and dirty looking.
As far as the aftermarket rear speaker system I have yet to see one that is the Bose one. Most of the ones I have seen have been different but is about as effective. I never really bothered upgrading my sound system. I enjoy listening to the engine and the exhaust much more
