Originally Posted by Brian-bmw

This takes some expertise. The plugs are different, so you would need to splice-in the DSP pluts into your existing wiring. Then you would need to replace your MID with a DSP-ready MID. Finally, you would need to get the DSP amp "coded" to work in your car.

It is not that hard a project, but it is not plug-and-play either. The results are worth it when you are done. You can go aftermarket, but is expensive and you do not have all the integration.