Faced with feverish speculation about the parity fueled by five of the six Mustangs in the field that eliminated the top five in yesterday's race, the weight of the DJRTP exhaust system has been subjected to intense scrutiny. The system is intentional difficult to lower the center of gravity of the vehicle without having to rely completely on the prescribed sealed ballast system to reach the minimum weight of 1395 kilograms.
According to a team spokesman, there was a system that was heavier than necessary – but was removed on request by supercars following the Adelaide 500.
Motorsport.com has contacted Supercars for confirmation.
The heavier system dates back to the first part of last season, when the team was still operating the FG-X Falcon, which was introduced shortly after the composite panels were introduced to the Ford and Nissan teams.
Th The hasty re-homologation was due to the introduction of the ZB Commodore, which provides for its body an unprecedented use of composites.
In the category, there is currently no rule regarding the center of gravity, which is also the case with the heavier exhaust gases. Penske Mustangs are technically not illegal.
It is expected, however, that from Monday a center of gravity test will take place between a cross section of automobiles of all three manufacturers, which has yet to be confirmed by Supercars.  Scott McLaughlin is currently unbeaten in the Penske Mustang after having won all four races of the 2019 season so far.