You have a very large range of amplifiers to choose from which meet that criteria. Browse around at Crutchfield and get a clearer idea of what you're looking for, then come back with more information:

- Intent to use car's factory speakers or to replace with real speakers?
- Number of speakers and their power handling capacity?
- Intent to install a subwoofer?
- Intent to install yourself or have professionally installed?
- Loud volume levels desired?