One solution would be to connect a 2 ohm power resistor in series with each of the stock speakers.
Pros:
1. It'll give you a nice 4 ohm load that will make your head unit happy.
2. It's cheap.
3. It's easy.
Cons:
1. You'll be wasting half of your HU's power in the resistors - which means that your system won't play as loud.
Pros:
1. It'll give you a nice 4 ohm load that will make your head unit happy.
2. It's cheap.
3. It's easy.
Cons:
1. You'll be wasting half of your HU's power in the resistors - which means that your system won't play as loud.
