To supplement Fubar's post, at Rally VI while at the track with Rear Exit Headers (M-9430-GTX), I melted the connector that powers the solenoid on the starter. Fortunately, with Rich Roback's assistance, we were able to keep the wire connected with application of some RTV, which was sufficient to get me home (about 540 miles).
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Then, Shadowman helped out by letting me know that the connector shell has a Toyota Part Number 90980-11400, and that the metal connector terminal with a 5" pigtail wire for repair has number 82998-12480. I ordered these through a local Toyota dealership. When I got to replacing them, I found that my wire and metal connector were fine, and snapped right into the new plastic connector shell.
Since then, when I was at the GT Guys in the summer of 2013, they told me that they had heat shields available for this area and also the clutch line, so I had them installed for heat protection.
I would recommend these shield to anyone running the Rear Exit Headers, as the four tubes are right next to this connector prior to entering the large collector which is seen in the photo. In fact, probably all configurations would benefit by having the GT Guy heat shields added.