Could be but it wont be leaps and bounds louder though, maybe not enough to justify the extra money spent. What all electrical upgades have you done to the car? Big 3 at least? If you do get a bigger amp then Im pretty sure you will end up needing to add two batteries, one under the hood and one in the trunk. Your car's alternator is made to supply the vehicle with power and leave you a little bit left over for accessories but not a 1200 watt or 2500 watt system. So you are going to be spending more than 400 on upgrades period. To what maybe gain a db or two, that might or might not be audible.