Enfinger began competing in the ARCA Re/Max Series in 2008, entering four races that season. He continued on a limited basis over the following two seasons, posting a pair of runner-up finishes in 2009 at Chicagoland Speedway and Kentucky Speedway while primarily driving for a family-owned team that merged with RAB Racing in 2010.
Moving to Allgaier Motorsports for 2011, he ran his first full ARCA season and won a pole at Berlin Raceway, finishing fourth in the standings. A breakout 2013 season with Team BCR brought his first ARCA win at his home track of Mobile Speedway, followed by a second victory at Iowa. In 2014 he opened the year by winning the first three races at Daytona, Mobile, and Salem, adding a fourth victory at Elko before a mid-season switch to GMS Racing. Despite six wins that year he finished second in the championship to Mason Mitchell after an engine failure and crash in the final two races. Enfinger won the 2015 ARCA championship with GMS Racing, opening with a Daytona victory and adding five more wins across the season.
Enfinger made his Truck Series debut in 2010, running three races. After further limited appearances, he returned full-time in 2016 with GMS Racing in the No. 33, winning a pole at Daytona before claiming his first career Truck win at Talladega in the fall race, leading the most laps that day.
ThorSport Racing hired Enfinger to drive the No. 98 full-time from 2017 onward. He scored his second Truck Series win at Las Vegas in 2018 and finished fifth in the standings. In 2019 he clinched the Regular Season Championship after the Michigan race but was eliminated from the playoffs at Las Vegas following an engine failure caused by Ilmor-supplied NT1 engines suffering severe detonation; NASCAR declined ThorSport's request to reinstate him. He finished seventh for the season despite winning no races.
The 2020 season was Enfinger's most prolific, as he broke a 28-race winless streak with a narrow overtime victory at Daytona over Jordan Anderson by 0.010 seconds. He added wins at Atlanta, Richmond, and Martinsville, the last of which qualified him for the Championship Round, where he finished fourth in points as the only non-GMS Racing driver in the final four.
Due to a lack of sponsorship, Enfinger shared the No. 98 with Christian Eckes in 2021, also making intermittent starts for CR7 Motorsports. He returned to GMS Racing full-time in 2022 and 2023. His 2023 campaign was exceptional: wins at Kansas, Gateway, and Milwaukee, combined with consistent finishes, placed him inside the Championship 4. He finished second in the final standings at season's end.
Enfinger moved to CR7 Motorsports full-time in 2024, driving the No. 9. Despite no wins in the regular season, five top-fives and eight top-tens placed him in the playoffs, where he won at Talladega to give CR7 its first series victory. He followed that result with another win at Homestead, reaching the Championship 4 a second consecutive year.
Enfinger made his Cup Series debut on June 8, 2023, filling in for an injured Noah Gragson at Legacy Motor Club in the No. 42, finishing 26th at Sonoma. He had previously failed to qualify for a Cup attempt at the 2011 Homestead season finale. He also made a single Xfinity Series start on May 29, 2021, for Sam Hunt Racing at Charlotte, qualifying despite the car being slowest in practice before crashing out in contact with another competitor.
Enfinger grew up in Fairhope, Alabama, on the Gulf Coast. He married Michelle Dupre on January 16, 2016, in Fairhope; the couple have a son, Carson, born in June 2021.
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