whoever said Forged and Hypereutectic was probably right, read here...
http://www.carcraft.com/techarticles/ccrp_0810w_mahle_piston_alloy_comparison/index.html
4032 being high silicon probably qualifies it as Hypereutectic alloy, the 2618 probably Hypoeutectic
forged construction, better than cast... best of both worlds?
depends upon the application

but a 4.30 rear gear sounds like a lot, with a 26" tire you'll tach 6k at 108 mph
there'll be phantoms, there'll be fires on the road... and the white man dancing