Aston Martin will race with the same Balance of Performance at this month’s World Endurance Championship finale in Bahrain with which its Vantage GTEs proved competitive at the start of the season.

The Aston will be permitted to race with the same 29.1mm engine air-restrictor that it used at the Silverstone and Spa WEC rounds in April and May respectively.

The restrictor has been restored to its original 2015 diameter after a 0.5mm cut ahead of the start of the second leg of the WEC starting at the Nurburgring in August and a subsequent 0.2mm increase for Fuji in October.

The move by the FIA Endurance Committee follows four races during which the GTE Pro class Astons proved off the pace of the Porsche 911 RSR and the Ferrari 458 Italia in the races.

Aston Martin Racing team principal John Gaw told AUTOSPORT: “We think the BoP was correct for Silverstone and Spa, and we will find out if it is correct for Bahrain when we get there.

“We are going there with more of a chance than we have had in the past few races, but there has been quite a bit of tyre development for the other manufacturers so we have yet to be convinced.”

Porsche also received a 10kg weight break for the ‘Ring, which was cut to 5kg for Fuji.

The BoP in GTE Am has also been changed: the Astons now have the 29.1mm restrictor; and the minimum weights of the Vantage and both old and new Porsche 911s have been increased by 5kg.

AMR will be back to full strength in Bahrain with the return of the Danish-driven entry in which Nicki Thiim will make his first appearance alongside Marco Sorensen and Christoffer Nygaard since the Le Mans 24 Hours in June.

The team withdrew from last month’s Shanghai round in an apparent protest at the BoP.