Top-class prototype racing 2023 debut at the
2023 24 Hours of Daytona. Yelloly moved into the
IMSA SportsCar Championship for the 2023 season, becoming part of the
BMW M Team RLL works team which entered a
BMW M Hybrid V8 into the GTP category. Throughout the season opener at
Daytona, technical issues would plague the outfit, which went on to finish 49th overall after an early hybrid system problem forced the No. 25 car to spend two and a half hours behind the pit wall. The team bounced back in
Sebring, where, having engaged in battles with other cars in the category for the majority of the race, Yelloly profited from a collision between the No. 10
Acura and the pair of
Porsche 963s ahead to take second place. At
Long Beach, Yelloly qualified fourth. The race itself proved to be frantic, with Yelloly tapping the
Acura of
Tom Blomqvist into a spin at the first corner and keeping third place until the mandated driver change afterwards. Teammate
Connor De Phillippi fought for a spot on the podium for the remainder of the contest, eventually securing another runner-up finish after a late-race crash from
Ricky Taylor. Eighth in
Monterey followed, as Yelloly lost third with 30 minutes to go before dropping down the order with old tyres. At
Watkins Glen, the #25 crew fought up front all day and finished second, though they inherited the win after the #6 Porsche was disqualified. Yelloly and De Phillippi continued their strong form in
Mosport, where they finished third, but multiple incidents for De Phillippi and a later technical issue led to a retirement at
Road America. Third in
Indianapolis and seventh at
Petit Le Mans resulted in Yelloly finishing sixth in the standings. Simultaneously, Yelloly remained with
ROWE Racing in the
GTWC Endurance Cup, sharing a car with
Philipp Eng and
Marco Wittmann. At the opening round in Monza they took a dominant win from pole position. In Le Castellet, Yelloly lost the lead to
Raffaele Marciello and lost two more positions as the car's performance declined going into the night, though a penalty ahead promoted him to third. Then, a week after Yelloly had given BMW their maiden win in the GTP class at Watkins Glen, he and his teammates won the
24 Hours of Spa — Eng had driven the car into the lead on Sunday morning before Yelloly created a ten-second gap following a safety car with four hours to go. However, a lowly 15th at the Nürburgring and simultaneous victory for the ASP-Mercedes meant that the No. 98 crew went into the Barcelona finale 18 points behind the #88. Tenth place at the final round meant that Yelloly, Wittmann, and Eng finished second in the standings.
2024 Going into the
2024 IMSA season, Yelloly and De Phillippi remained with the #25 crew. Seventh at
Daytona and fourth at
Sebring preceded a missed fifth at
Long Beach, where De Phillippi crashed out at turn 6, having pitted to repair damage beforehand following a pileup. More misfortune followed in
Detroit: De Phillippi first slid into a tyre barrier on cold tyres after exiting the pits, then broke his car's rear right suspension on the exit of turn 2 minutes later.
Road America saw Yelloly make a race-ending mistake, as the Briton crashed into the wall at Carousel corner. Fuel strategy conspired to earn the No. 25 its only podium of the season in
Indianapolis, as Yelloly's crew came home second just behind the sister car. Yelloly and De Phillippi finished eighth in the championship, having retired from the season-ending
Atlanta event following a technical failure. After the race, BMW announced that Yelloly would be leaving the manufacturer after six years as a
works driver. During the announcement, BMW M Motorsport director Andreas Roos stressed that Yelloly had "everything a manufacturer could wish for in a racing driver", describing him as "extremely talented", "a great guy", and reliable.
2025 In 2025, Yelloly made a switch to the
Acura Meyer Shank Racing to partner
Renger van der Zande in
IMSA. The British driver finished 5th in the overall Drivers' and Teams' Championships, having won the
Detroit Sports Car Classic and scoring two podiums, in the
12 Hours of Sebring and
SportsCar Grand Prix, with his individual performance standing out.
2026 Yelloly continues his IMSA GTP program with Meyer Shank's team in
2026.
LMP2 outings 2024 victory after a race-long battle with VDS Panis Racing In 2024 Yelloly made his
LMP2 debut, contesting the final three races of the
European Le Mans Series. Driving in the Pro-Am class at
Nielsen Racing as a replacement for
Albert Costa, Yelloly scored a class podium at the
Portimão season finale.
2025 The second part of Yelloly's 2025 campaign was competing in the
24 Hours of Le Mans and in the
ELMS for
Inter Europol Competition alongside
Tom Dillmann and silver-ranked
Jakub Śmiechowski. Yelloly, Śmiechowski and Dillmann have won the French classic. The number 43 car led the race from the morning, maintaining a lead of no more than twenty seconds over the number 48 car of the
VDS Panis Racing team. The last hour of the race had a dramatic twist; 34 minutes before the finish, the team was given a drive-through penalty as a result of Yelloly's speeding in the pit lane during the previous stop. Subsequently lost lead was regained after another few minutes due to a suspension failure in the rivals' car. Yelloly finished the race with a lead of nearly two minutes over Panis team. The Brit was also the fastest driver of the team and the second fastest LMP2 driver of the race. The battle with VDS Panis Racing continued throughout the year in the ELMS series, where it ended with a victory for the French team. Five second places in a total of six races earned Yelloly and his teammates second place in the overall series standings.
2026 In the 2026 season, Yelloly will repeat his 2025 LMP2 program, returning to the
ELMS and
24 Hours of Le Mans with Inter Europol Competition, driving alongside Dillmann and Śmiechowski.{{cite news|url=https://assets.lemans.org/explorer/pdf/courses/2026/24-heures-du-mans/uf52uwz03c9qp54byxkb.pdf|title=2026 PROVISIONAL ENTRY LIST V1 ==Formula One==