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That's not my photo, but I did the internal mod. Do you see where the arrow is pointing from "3" towards the inlet pipe? That's where I cut my inlet pipes. I used a dremel with a flex shaft and a 1 3/4 inch cutting wheel. Following that, I used a chisel and a pry bar to open the holes to about 1". There are two holes in each pipe, and I bent the metal so it would direct flow out of the pipe into the chamber. The sound is perfect: deep and throaty under acceleration, noticable at idle, but NO resonance at highway cruising speeds. I also modified my secondary cats, which helped.
My car is a 2000S w/ an Evo intake.
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