Is the Porsche 997 GT3 RS 4.0 a good investment?

The thesis

The ultimate 997 and the largest naturally aspirated 911 engine ever (4.0L, 500hp). Only 600 built globally, and it's the last GT3 RS of the Mezger-engine era. Market is holding steady in the £200–280k range, reflecting strong collector recognition. However, this car has already had its major run (climbed from ~£100k in mid-2010s to £200k+ today) and sits at the top of its cycle. Still a blue-chip hold, but less upside than earlier-cycle candidates and sits at lower end of your budget.