2.75 kilograms = 6.0627 pounds.
That's a pretty light weight seat!
But; it doesn't include head restraint, shoulder supports, or leg protection.
When I get mine all bolted together, I'll weigh it and let you know where I am at.
That seat is also carbon fiber, and (if you convert the current exchange rate) VERY EXPENSIVE!!!
I think it was 620.00 British Pounds. Don't have a conversion chart for that.
I'm using Butler Built and Kirkey stuff; and have what amounts to a full containment seat.
I would re-think your dollars VS weight savings. Besides; We are going SCCA, and INEX rules don't necessarily apply.
Just my thoughts,
Steve