yea exactly, this is a replacement if yours are broken
the catch on these cars is this...
if you change one piece of the stock system it all has to go, the stock nakamichi amp will not run with any aftermarket parts, so if you get new speakers nothing in the system will work
you're either gonna have to be spending 1000$ plus on an aftermarket system or replacing your broken ones with stock systems.
Nakamichi's are really good systems, i made the mistake of replacing it so early, unless you are getting a very very nice aftermarket system the stock will suffice you unless you want to spend about 600$ on custom installs and 1000$ or more on parts depending on what you get just so you get cool features like ipod adaptation features
i couldnt see why you cant install a 10" instead of an 8" if thats what you think you have, theres not less space on a sc300 then a sc400 so i imagine you could do it. Buy these if you want to get excellent condition stock pieces, otherwise if you want aftermarket be prepared to make a very large investment
let me know,
chase
and yes you already have a stock amp, these are simply replacements for broken pieces of ur system