I'm running the EMI thunder exhaust on my 502 mag efi. The starboard manifold has developed a small crack that is seeping water, plus two new riser gaskets & the 3/4 npt plug are all seeping water. Will any other aftermarket aluminum manifold work with the eddie stainless risers?

You can only use EMI manifolds with EMI risers.

Thanks Griff, I have already had a problem with the portside manifold, but they were still under warranty then. So i was curious about an alternative.

That is the reason that I quit selling them. I sold over 50 sets of them and had problems with the vast majority of them. It just wasn't worth it anymore. Sorry, but you have to replace it with the same.
Eddie