The Enkei site has the 16" at less than 18lb and the 18" at 22.5lb.
http://enkei.com/wp-content/uploads/2019/01/RPT1.pdf
I had RP03 on my Outback and they were great wheels. They won't look good with my use but those weight savings are BIG.
The 16" would not fit a 5th gen, however, would it?