As a teenager Forsberg learned to work on cars using his black 1988 Mazda RX-7 FC, which he credits Tony Angelo, Initial D, Option Magazine, and his brother Erik with bringing him to. In the winter of 2003 he held a drift event at Old Bridge Township Raceway Park, New Jersey; by March 2003 facility president Mike Napp gave him permission to organise motorsport events there.
In 2004 Forsberg placed second at his first Formula Drift event at Road Atlanta and followed with another podium at Round 2 in Houston, Texas. He drove the 350Z SR20DET for most of the inaugural season, switching to a borrowed Nissan Silvia S13 for one round due to technical difficulties. After Irwindale, Forsberg became the first American driver to defeat a Japanese driver in D1 tandem competition, beating Team Orange's Kazuhiro Tanaka.
In 2005 he competed for Team Falken in a Silvia S15, winning the season finale against Rhys Millen and claiming his first Formula Drift event victory. In 2006, Nissan North America supplied him with a convertible 350Z; the team swapped the stock VQ35DE for the Nissan Titan's VK56DE V8 engine. In 2007, Forsberg ran his own team on a shoestring budget in partnership with Maxxis tires, finishing second overall and securing a primary sponsorship from NOS Energy Drink. In 2008 NOS committed to a full title sponsorship; the season opened with a victory at Long Beach over Tanner Foust and Sam Hubbinette.
Forsberg won his first Formula Drift championship in 2009, simultaneously claiming the Tires.com Triple Crown bonus prize — the first driver to win both in the same season. His title was also the first for a driver with a purely drifting and enthusiast background rather than professional motorsport experience.
In 2011 Forsberg moved to a Nissan 370Z fitted with a Nissan Motorsports engine supplied by Nissan; the team finished third overall. In 2012, MA Motorsports took over car preparation at a facility in Maryland, focusing on weight reduction and engine reliability. Forsberg finished second overall in 2013.
Forsberg held the championship points lead from the first round to the last and clinched his second Formula Drift title in 2014. He also proposed the "Start Line Chicane" concept to Formula Drift that season, a format change subsequently adopted in nearly every drifting series worldwide. Forsberg Racing expanded to two cars in 2014, with Jhonnattan Castro driving an updated version of Forsberg's 2012 370Z chassis.
Despite no event victories in 2016, Forsberg was crowned Formula Drift champion for the third time, piloting his V8-powered Nissan 370Z. Two third-place and four second-place consecutive finishes allowed him to take the championship lead after Round 6 in Seattle and hold it through the final round at Irwindale. He also claimed the Formula Drift World Championship following a qualifying round in Okayama, Japan.
In 2017 Forsberg moved back to California; Nameless Performance took over team management and developed a twin-turbo VQ35HR package, but repeated engine failures left the team eleventh overall. In 2018 Forsberg retook direct control of the team, rebuilding the car in Southern California; the team secured a victory at Round 3 and finished fourth overall. After two seasons struggling with the VQ platform, the team committed to the Nissan VR38DETT engine in 2019, proving its reliability while finishing sixth overall. In 2020 Forsberg won Round 6 in Dallas and finished fifth overall despite engine failures at Rounds 7 and 8.
Forsberg Racing entered the 2021 Gridlife Touring Cup wheel-to-wheel championship with Bryan Heitkotter driving a Nissan 370Z. The team also fields two entries in the eSports World Championships, which simulates the FIA GT World Challenge using Assetto Corsa Competizione; both Heitkotter and Forsberg drive a Nissan GT-R NISMO GT3.
In 2014 Forsberg purchased a 1975 Datsun 280Z equipped with an RB motor for $4,000. Built with RAD Industries for display in AEM's 2016 SEMA booth, the completed car — dubbed "Gold Leader" — featured a 500 hp RB25DET engine, TechnoToy Tuning suspension, Wilwood brakes, and custom SSR MS-1 wheels, winning SuperStreet/Meguiar's Best in Show and the Sony PlayStation Best Import award.
The "Rally Z" is an American Rally Association-compliant build created in collaboration with Nissan/Nismo and Broken Motorsports as a homage to the 1971 East African Safari Rally overall-winning Datsun 240Z; planned for display at SEMA 2020, it was shelved due to the global pandemic.
For his YouTube channel series Good Enough!, Forsberg purchased an ex-Brandon McReynolds NASCAR, ran it at Irwindale Speedway with Ryan Tuerck, and subsequently swapped in a 2JZ-GTE producing 750–800 horsepower. The 2006 Infiniti M56 "La Flama Blanca" is a four-seat demo drift car powered by a 500 hp VK56DE 5.6-litre V8 engine, built by Forsberg in 2010 as a ride-along vehicle.
Forsberg is the all-time podium leader in Formula Drift and holds the record for most head-to-head battle wins and most consecutive podiums (six) in series history. He won the Formula Drift championship in 2009, 2014, and 2016. He was invited to the Goodwood Festival of Speed in 2017. In the 2016 SCORE Baja 1,000 he recorded a DNF. In 2018–2019 he competed in D1 China driving a BMW M4 2JZ, finishing third overall.
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