This doesn't answer TJ'* question (although I think it would be a close fit with a PCM relocate), but the setup in my sig nets me within 5° of ambient temps in the summer. The heatshield cost me less than 20 bucks. All parts from Home Depot, and a little custom laser engraving
Pipe is one of the limited ADTR'* (autozone pipe will substitute, I did DrJay'* with him), and any filter with a 3" flange like DrJay mentioned. One of these days we need to calculate surface area.
By my rough calculations, the RX-4750 actually has more surface area. The advantage it has is that it'* surface area only takes up a width of 6" depending on orientation. I had more vertical height to mount it than I did width, so it was the perfect solution. Pdad mounts his the other way, due to the different application of the 2000+ engine bay.
The E-1009 is longer by 3/4 of an inch, but is only 5.8" in diameter over this whole length. The RX4750 has a base of 6x8" oval, tapering to a 5" round at a length of 6.5" from the base, and also has a velocity stack on the end. I don't believe the E-1009 has the velocity stack (Xstream top). The end of the 4750 provides another 20sq" of surface area.