This car is eligible for use in the Daytona Prototype International (DPi) class of the IMSA sanctioned WeatherTech Sportscar Championship.

[7] Nearly the entire front section of the car underwent a redesign, with the most notable changes being a new wheel pod design, as well as revised positions for the brake ducts and mirrors.

[11] It was later announced by Mazda in July 2017, following the round at the Canadian Tire Motorsport Park, that its 2017 Programme with Speedsource was to be terminated, with immediate effect, in favour of early preparation for next season's campaign with Joest Racing.

[19] Ahead of the 2019 season, the car once again underwent a series of upgrades, focusing on the engine, and aimed at improving its reliability, and raising its power limit.

[32][33] At the fourth race of the season, the Advance Auto Parts Sportscar Showdown, held at the Circuit of the Americas, the cars fell back pace-wise, relative to the rest of the field for qualifying, with the #55 ending the session 7th, 2.4 seconds slower than the pole sitter, and the #70 qualifying behind in 10th, 3.1 seconds away from the pole time.

[37] For the fifth race of the season, the Chevrolet Detroit Grand Prix, held at the Detroit street circuit, it had initially appeared that the #55 of Jonathan Bomarito would start from the front row of the grid, in 2nd place, having been beaten to pole by Renger Van Der Zande in the #90 VisitFlorida Racing Riley-Multimatic MkXXX during the qualifying session, which lasted a mere 5 minutes.

In the sister #55 car, Tristan Nunez had originally looked set to come home 6th, but later took advantage of a late-race spin by Stephen Simpson in the JDC-Miller Oreca, to finish 5th.

[43] At the seventh round of the season, the Mobil 1 SportsCar Grand Prix, held at the Canadian Tire Motorsport Park, the two cars had a mixed session, with the #55 coming in 5th, clocking in a 1:08.959, just 5 tenths away from pole, while the #70 in 10th, rounding out the Prototype class, finishing 1.5 seconds behind the polesitter, the #10 Wayne Taylor Racing Cadillac DPi-V.R.

[44][45] On race day, the two cars came home in 4th and 5th, the #55 leading the #70 home, with the #55 having been in the top 3 positions at one point, pitting during a heavy shower, but eventually falling back, as the track dried up following the downpour, allowing the slick-shod runners to slice their way up their field, while the #55 was forced into the pits for a change to slicks.

[50][51] The race was no better for the team, with both cars hitting trouble early and being unable to recover, the #55 retiring after a major fire, and the #77 later suffering gearbox issues amongst other things.

Both cars failed to make it to the finish, which left the team with a much-reduced mileage compared to their class rivals, many who successfully made it to the chequered flag.