What kind of parts are we talking about?
A lot of solid parts can be made out of billet aluminum (such as flywheels, drive shaft, etc).
Body parts made from carbon fiber are extremely light and extremely strong (not to mention extremely expensive  )
Most exhaust parts are made from stainless steel.
__________________ '01 Silver V6 5-Speed
Show:17x8 Anthracite Bullitts w/Kumho 255-45s, spoiler, smoked headlights and fog lights, black LED 3rd brake light, Mach1 grill delete, Mach1 chin spoiler, splash guards, Hurst badge, chrome exhaust tips, carbon fiber bumper inserts, 8" antenna, black hood stripe, 232 badges, Ford Racing license plate frame (in the box: hood scoop, rocker stripes)
Go: Divorced dual exhaust w/Original 40's, AM CAI, Hurst shifter, SCT 91+ Tuned
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whats a good type of material to buy parts made of? 
