if i remember, stock speakers are 20watts rms.... the most power ive seen from an aftermarket deck is 23watts rms (SONY!), so you should be fine.... some decks push out 25, and one even does 30 (with extra power wiring), but im sure your deck is between 18-23

1999 SE White AVH-P6500DVD Infinity Reference 6500CS Pioneer 5x7s Punch 360a2 Punch 500a2 Adire Tempest in a custom sealed 3.4cuft box Modded Xbox Still need Midnight Cloth Headrests... and if somebody has fold down rear seats....