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Before you install the GReddy Manifold, you need to make stress relief cuts in it. This is where you make them (Thank you JimB-15psi.com for the picture).
a sawzall with a metallic blade works well, but you'll tear up about 3 blades doing it.
Don't forget to plug the holes with rags, you don't want metal shavings blowing through your turbine when you fire it up.