Henco

Hi, I have a 2002 Corolla ascent seca (Manual) and i would like to upgrade the car so that it has the same features as a levin or ultima. What features are in my ascent that are meant for the levin or ultima? For example, I went to the local wreckers and found a 2003 corolla with tweeters, I went home and was able to fit these to my 2002 corolla because Toyota had the wiring already there. Are there any other upgrades like this? Cheers.