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  1. S

    Gibson gp100 headers on 97 gmc Sierra z71 what to do with air tube?

    The egr supply tube can be plugged with a straight thread metric plug, I find em at hydraulic shops. The egr system will now have to be properly disabled though.... otherwise you'll end up with a check engine light and pinging under load.
  2. S

    I Just received my BBK 407 headers

    Thats for the egr supply. The threads are terrible even when you do find a plug for it. I found a plug at a hydraulic shop. Ive been round and round with bbk tech about these 40070 headers btw....
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