You mean polycarbonate material. Yes! Better than most materials. You can find them on the 1999 Jeeps GC and the 2000 Dakotas.GOT said:The one thing that seemed odd to me about the motors is the fiber (or resin?) manifold cover... or whatever that cover is that is on top of the motor (not the fancy lawnmower-like cover). I hope that cover will stand up to the temp swings and heat of the motor.