Well I do not want to add a new head unit... it'd screw up the lines of the car and the idea of both is stupid to me. So waht I want to do is add speakers. I'm not sure but would I have to add an 4 way amp to power the speakers? My friend just bought 2 sets of pioneer speakers and dropped it into his stereo in his altima; and its all run through the stock amp/head unit (I dont know if the GLE's had a seperate amp). It Sounds good.. Question is what he did alright electrically? I mean his alternator just went out on him yesterday... (108k mi 96 Altima, i suppose it was time) I'm just scared that dropping any new speakers or amplifers or even subs will kill my electrical system. I had a 97 Acura CL before I had the TSX, I hooked that WHOLE system up... I had a new head unit and speakers driven off of that; and 2 MTX subs run off of an Alpine Amp installed somewhere in the 5th year around 82k miles. At 95k miles and 8 months later the alternator went out on me (btw I had no CAP) and I think that was premature due to the extra power the amp for the subs drew although it coulda been just due. So my real issue is; what is the actual damage that adding or upgrading the system in a car is? What can be done to prevent future problems?