I just wanted to share with you folks a few things I've learned about these systems. I've studied them deeply, participated in a few forums and there's a few caveats to be aware of.   All these systems need decent idle vacuum. Holley states 6 inches for their Sniper and F.A.S.T. says 9 inches. Some users have had problems because they weren't warned of this pre-sale. The folks at F.A.S.T. will tell you they work best with single plane intake manifolds. All these systems include a O2 sensor tha