it's called foam board, you get it from your local crafts store. it's cheap, takes less than 5 minutes to make a heat shield. You just have to replace it every few months as it gets weak.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15