Hi Sulph! The wiring loom adaptors are great aren't they?!
If your like me, and change your mind all the time.... the next step would be to install an amplifier.

If you want more information, I've installed quite a few before just throw us a PM and ill be sure to help you if I can.

Failing that, as has been said before, the guys from Westside Sound and Image will help you out for sure. They are awesome!! In fact, my car will be making its way there sometime over the next few months for some work