News First 2020 GT500 Dyno Yields 705 RWHP! mustang6g Posted onDec 4, 2019 at 9:49 PM Updated onUpdated on Dec 4, 2019 at 4:49 PM Here’s the first known 2020 GT500 dyno pull where the top dog Mustang put down 705 rwhp! View the dyno run video inside. mustang6g View all 2053 articles