IMSA has just made an unprecedented change to the Balance of Performance in the GT Le Mans category ahead of this weekends Mobil 1 Sportscar Grand Prix at Canadian Tire Motorsport Park.

Because the teams are at CTMP just days after leaving Watkins Glen, the changes come down past IMSA's self imposed seven-day deadline.
"Due to the atypical shortage of days between the Watkins Glen and Canadian Tire Motorsport Park Events, IMSA is exercising Article 2.2.2. (language below) to enable a change to the IWSC CTMP Balance of Performance Tables outside the standard notification timeline listed in Attachment 2, Paragraph 2.4. of the IWSC Sporting Regulations and SSR.

"2.2.2. Principal Rule. On occasion, circumstances are presented, either unforeseen or otherwise extraordinary, in which strict application of the rules may not achieve the Purpose. In such rare circumstances, Officials, as a practical matter, may make a determination that is not contemplated by or is inconsistent with the rules. Such determinations are reviewable by the Supervisory Officials. All such determinations are Conclusive, except as provided for in the rules."
The Corvette C7.R has been given a 0.4mm wider air restrictor, a richer air/fuel mixture and 2 liters more fuel to compensate for the lambda. Additionally the Corvettes will shed 22 pounds.

Porsche's 911 RSR will also cut 22 lbs, the Ferrari 488 has been given an extra liter of fuel, while the BMW M6 GTE was left alone.

Conversely, the Ford GT has been hit with a 33 lb weight ballast and had boost turned down from 2000-7200 RPM. This is the third BoP change to the Ford GT, leaving it 33 pounds heavier than when it started the season.

We'll be providing coverage of the entire weekend live from CTMP, stay tuned.