the weight is the same from what i've been told, but the replicas are a better wheels b/c the chrome and stuff doesnt flake off like the real ones (kind of sad)
They are cast. If you call Saleen and ask them questions about anything before 2005 they don't know sh*#.
The replicas are better quality, cast and chrome than the Saleen wheels. The fronts are good but be careful because the offset on the rear 10's are a bit different and stick out a bit farther than the Saleen 18x10's so a keen eye will be able to tell the difference.