IMSA shares the limelight with IndyCar at the Detroit Grand Prix, with the sports cars and GT machines racing on Sunday (AEST) and the open-wheelers on Monday (AEST).
At its biggest endurance events, IMSA features four classes – GTP, LMP2, GTD Pro, and GTD.
However, for the Chevrolet Sports Car Classic, only the fastest GTP and GTD Pro competitors will take to the narrow streets of Detroit.
For fans unfamiliar with the naming convention, GTP is the terminology IMSA uses for what the FIA World Endurance Championship calls Hypercar.
Both GTD classes are for GT3 homologated cars, with the two GTD classes divided by all-Pro and Pro-Am driver line-ups.
Mostert will join Vasser Sullivan Racing in the #14 Lexus RC-F GT3 alongside Aaron Telitz.
Secure your spot today.
The team will field two entries with Jack Hawksworth and Ben Barnicoat in the #15 sister car.
Sunday’s race is also 100 minutes, making it one of the shortest races on the calendar.
“I’m so excited to have the opportunity to race for Vasser Sullivan,” said Mostert.
“I’ve raced in the (United) States a few times and always thought that the team looks so professional and like a tight-knit family so it’s an honour to be able to race for the team.
“The Lexus RC F GT3 car looks incredible, and I can’t wait to get my first laps.
“I’m new to the Toyota-Lexus family and being able to get this opportunity being an Australian driver is very much a pinch yourself moment.
“I can’t wait to get to Detroit! I love street tracks and am looking forward to the challenge.
“I can’t thank my Supercar team, Walkinshaw TWG Racing, enough for allowing me to compete.”
Telitz said he is looking forward to working alongside Mostert.
“Really looking forward to teaming up with Chaz (Mostert) on the streets of Detroit,” said Telitz.
“It’s always a lot of fun to race with someone new and Chaz brings a ton of experience on street courses from racing in the Supercars Championship.
“Can’t wait to grab a trophy with him this weekend!”
How to watch Chaz Mostert in IMSA at Detroit
Live coverage of the IMSA SportsCar Championship at Detroit will be live-streamed via YouTube, IMSA.TV, and Speedcafe.
What time does the race start?
The IMSA SportsCar Championship Chevrolet Sports Car Classic gets underway at 6:10am AEST on Sunday, May 31.
IMSA SportsCar Championship Detroit schedule (AEST)
Friday, May 29
Practice 1 – 10:00pm (180 mins)
Saturday, May 30
Practice 2 – 1:30am (180 mins)
GTD Pro Qualifying – 6:50am (15 mins)
GTP Qualifying – 7:10am (15 mins)
Sunday, May 31
Race – 6:10am (100 mins)
IMSA SportsCar Championship Detroit GTP entry list
| Num | Driver 1 | Driver 2 | Team | Car |
| 5 | Tijmen van der Helm | Laurin Heinrich | JDC-Miller MotorSports | Porsche 963 |
| 6 | Laurens Vanthoor | Kevin Estre | Porsche Penske Motorsport | Porsche 963 |
| 7 | Felipe Nasr | Julien Andlauer | Porsche Penske Motorsport | Porsche 963 |
| 10 | Ricky Taylor | Filipe Albuquerque | Cadillac Wayne Taylor Racing | Cadillac V-Series.R |
| 23 | Ross Gunn | Roman De Angelis | ASTON MARTIN THOR Team | Aston Martin Valkyrie |
| 24 | Sheldon van der Linde | Dries Vanthoor | BMW M Team WRT | BMW M Hybrid V8 |
| 25 | Philipp Eng | Marco Wittmann | BMW M Team WRT | BMW M Hybrid V8 |
| 31 | Jack Aitken | Earl Bamber | Cadillac Whelen | Cadillac V-Series.R |
| 40 | Jordan Taylor | Louis Deletraz | Cadillac Wayne Taylor Racing | Cadillac V-Series.R |
| 60 | Tom Blomqvist | Colin Braun | Acura Meyer Shank Racing w/Curb Agajanian | Acura ARX-06 |
| 93 | Renger van der Zande | Nick Yelloly | Acura Meyer Shank Racing w/Curb Agajanian | Acura ARX-06 |
IMSA SportsCar Championship Detroit GTD Pro entry list
| Num | Driver 1 | Driver 2 | Team | Car |
| 1 | Neil Verhagen | Connor De Phillippi | Paul Miller Racing | BMW M4 GT3 EVO |
| 3 | Antonio Garcia | Alexander Sims | Corvette Racing by Pratt Miller Motorsports | Corvette Z06 GT3.R |
| 4 | Tommy Milner | Nicky Catsburg | Corvette Racing by Pratt Miller Motorsports | Corvette Z06 GT3.R |
| 9 | Andrea Caldarelli | Sandy Mitchell | Pfaff Motorsports | Lamborghini Temerario GT3 |
| 14 | Jack Hawksworth | Ben Barnicoat | Vasser Sullivan Racing | Lexus RC F GT3 |
| 15 | Aaron Telitz | Chaz Mostert | Vasser Sullivan Racing | Lexus RC F GT3 |
| 59 | Max Esterson | Nikita Johnson | RLL Team McLaren | McLaren 720S GT3 EVO |
| 64 | Ben Barker | Dennis Olsen | Ford Racing | Ford Mustang GT3 |
| 65 | Christopher Mies | Frederic Vervisch | Ford Racing | Ford Mustang GT3 |
| 77 | Nick Tandy | Harry King | AO Racing | Porsche 911 GT3 R (992) |
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