i replaced the blown rear speakers with some really nice eclipse speakers and they didnt sound that great so i took them out altogether and ran the wires to a pair of old mtx three way 8" unamplified truck speakers behind the back seat - they dont take up much space at all compared to a sub enclosure, no rediculous wiring for an amp, capacitor, etc., i can move them easily or take them out altogether if i want and they sound really good
plus i painted the speaker grilles proton yellow they look like afterburners when you open the back door