I use the S&S. I like it. Intake leaks? Of course. I'm not sure this is kosher but, when I install the manifold I put a thin coat of red RTV on the head mounting surface and let it get tacky to dry-ish. Then I install the manifold. It doesn't leak and runs perfect. The stock butterfly and CV manifolds were no better. I have had less issues with the S&S than anything else.