i did this upgrade in my 97 GTP , settling on rear speakers and a sub was easy. but where i ran into problems was with the front speakers. i just couldnt get the sound out them that i wanted. i tried 2 different sets of speakers , before settling on a set of 5 1/4" Component Speakers. they came with their own crossovers . but you need some power to drive them. the difference in sound was like night and day.