I just installed my header heat shield, and like what i see so far...
I got it for $65 from ProLex Performance (I also got my 5zigen from them), here are some photos:
http://gusterzone.pair.com/hs/1.jpg
http://gusterzone.pair.com/hs/2.jpg
http://gusterzone.pair.com/hs/3.jpg
This isn't my car, it's the guy who owns PLP.... but you get the idea. The install takes 10-15 minutes TOPS. It's CAD designed, lazer cut stainless steel.

sales@prolexperformance.com
They sell al sorts of sick IS300 parts, like HUGE 4 piston stoptech brakes (oh man I want these!!!) and some TRD stuff too i think...
Tell 'em s0yb0mb set you ;-)