A decision to enforce further changes to Ford's all-conquering Mustang has provoked a response by defending Supercars champion, Kiwi driver Scott McLaughlin.

Supercars analysis determined the Mustang holds an aerodynamic edge over its Holden and Nissan rivals.

Led by DJR Team Penske star McLaughlin, the Mustang has won nine out of 10 races in 2019 and eight pole positions.

Its dominance has led to rivals claiming it has an unfair advantage and now the cars must undergo changes before next week's event in Perth, mainly to the rear wing.

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"Nothing like fire in the belly," McLaughlin tweeted when the news of the enforced changes was made.

It's the second time this year the Mustang has been ordered to undergo changes after it and the Holden Commodore had to undergo centre of gravity changes in March when a test showed a disparity with Nissan's Altima.

Under Supercars regulations, changes are allowed if a significant disparity exists between cars.

The continued revision of the Mustang's specification comes despite its initial specification being signed off in December by Supercars and the three teams responsible for vehicle parity — DJR Team Penske, Triple Eight and Kelly Racing.

"I guess now it will just feel a lot better when we win again," McLaughlin added on Facebook.

Ford's global director of motorsport Mark Rushbrook also expressed disappointment in the changes.

Supercars champion, Kiwi driver Scott McLaughlin, leads the way and aims to continue winning. Photo / Supplied
Supercars champion, Kiwi driver Scott McLaughlin, leads the way and aims to continue winning. Photo / Supplied

"This is a world class car ... we stand by the state-of-the-art package we introduced into the series," Rushbrook said in a statement.

"From here on we will do our talking on the racetrack."