The 2025 National Sports Sedan Series, known as the Precision National Sports Sedan Reason after its title sponsor, is an upcoming motor racing series for Australian sports sedans.
The series has very relaxed regulations allowing a broad range of custom-built racing cars to participate, with the proviso that they have bodywork resembling a road car.
A national competition for sports sedans dates to 1976, and the present series to 2004.
The series is sanctioned by Motorsport Australia, and its naming rights sponsor is Precision International, a supplier of specialty parts for racing engines.
The five-round series will consist of four rounds as part of the Trophy Tour, a new series of motor racing events organised by local clubs, racing circuits, and coordinated by Motorsport Australia,[1] and a single round supporting the GT World Challenge Australia category organised by SRO Motorsports Group.