With the typhoon manifold you have to clean it up yourself or its going to rob some power. I had one before and sold it to put back on my PI manifold for the 5.4l build.
You might see bigger gains putting the stock PI back on because those typhoons tend to have some flaws, arent of the best quality and they tend to heat soak really quickly.
Good gains for the mods though. Hope my info might shed some light.
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Steven Schildt
My Swap
3.8L v6 to 4.6L SOHC V8 (DEAD)
 5.6L SOHC v8 Running
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