How To Get A Good METAL! Sound?

There are a few options here but they are all based on personal preference. I think you would be impressed with the Boss Metal Zone pedal along with the preamp in your MG. Also consider getting hotter pickups installed in your guitar. Most of the tone comes from that alone. The EMG Zack Wylde Signature 81-85's are a good set to drop into just about any axe and instantly melt faces.