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you get 2 dif types of 4-2-1 headers from comptech.. TIG weld and MIG weld. One is more expensive than the other, only because of he process they use to weld the header. Go with the less expensive.. difference is minimal. I love the setup I have.. header/exhaust from comptech. It sounds really mean..
If you want an exhaust that works well and looks incredible, get the comptech tig. I had it, but i returned it for money issues(jdm convo.) It was a work of art.
i guess DC is okay. I haven't heard anything bad about them.. I personally like having comptech only because of the SpeedTV races with the Real-time team. So i know their stuff works.