Eibach is american made yes. They are a decent quality producer.
I'd rate their products as street/track, meaning that they are not
entirely race oriented. The weight will be a touch more than the stock
Arms, but in a lot of aplications weight reduction isnt the goal. If you're a competative racer then perhaps tms or some other arm is a better choice. If you want to improve the strength and adjustability of your rear camber than these kits are perfect!