RC:
It seems that the 991.2 GT3 RS gets a particulate filter, probably why they increased capacity but barely increased power. Very strong rumor that production (in high numbers) will continue past September 2018.
Good news...I guess...if true.
I heard production to November /december maximum
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997 GT3 RS 3.6 - 964 RS - 993 RS - 991 GT3 RS