Heavy rain caused a delay to the day's programme and the Thailand MotoGP track was wet when Race 1 finally got underway.
However, it would dry out, and Triple Eight capitalised by calling Abu Bakar Ibrahim in for a relatively early mandatory pit stop to get Stolz into the car and the car onto slick tyres.
The call meant a swing from fourth position at a 14-second deficit to the lead into a 10-second margin over the chasing pack once R&B and AAS/Absolute completed their stops.
Alessio Picariello was third for the run home in the AAS/Absolute Porsche before overtaking Leo Ye Hongli to claim a runner-up finish for himself and Vutthikorn Inthraphuvasak.
Race 2 of GT World Challenge Asia takes place today while, in New Zealand, Triple Eight Supercars driver Shane van Gisbergen is in action in the International Rally of Whangerei.