You didn't read very carefully either. It was cheaper to produce in low quantity production runs (due to the cost of molds and such). The 03 cobra motor is made in fairly high quantities. The block casting isn't and different than the rest of the blocks. The crank is the forged piece they've been using since 96 and is made in decent quantities. The rods/pistons are off the shelf components. Nothing about it is really unique or low production. Really. We're not talking 100 unit runs here.

As far as the polymer the components are made of goes, it sounds like the plastic intake on the 2v 4.6L engines.