I installed a MSD box on my car and now I have noise in my in stereo. I have a 4 channel and a 2 channel amp in the trunk. After I hooked up the box to try and get rid of the noise I grounded the amps to the actual frame of the car and then I ran a 4 gauge ground from the battery to the body of the car where there is a factory ground and ran a 4 gauge wire from the alternator to the battery to help it charge better. Also the power for the box is ran to the back of the alternator. Any suggestions?