Have been fighting a small collector gasket leak on my Hedman Hedders for quite some time - tried copper gaskets, the dead soft aluminum ones (best I've used), but still had small leak. Bought a set of Header Hush clamps for $31.95 locally, and leak is GONE. Definitely a nice setup. You still use a gasket (I stayed with the dead soft aluminum ones), the Header Hush simply clamps the flanges together completely flat. Good product. /forums/images/icons/cool.gif