NASCAR Hall of Famer Mark Martin couldn’t hide his excitement after hearing the roar of Roush Yates Engines’ newly rebuilt #6 Ford Valvoline. Martin, who raced in the iconic #6 car for Roush Racing during his prime NASCAR years from 1988 to 2006, took to his official X account to share his reaction to a video showcasing the engine’s powerful new sound.Mark Martin had spent some of the most memorable years of his career behind the wheel of the #6 Ford for Roush Racing. Driving his #6 car, he clinched 35 out of his 40 career Cup Series victories, 230 top-five finishes, and 361 top-10 finishes. The NASCAR legend finished runner-up four times in the final championship standings with Roush.Reacting to a video of the car firing up, the five-time IROC champion shared his excitement on his X account, writing:“Man that sounds sweet. Shout out to @roushyates for the rebuild 🔥 Thank you.”The reaction of Mark Martin struck a chord with longtime fans who still associate the Batesville, Arkansas, native with the #6 car, a number he made famous through his consistency, wins, and near-championship runs in the 1990s and early 2000s. The Roush Yates Engine rebuild of the #6 car marks a continued legacy of performance and innovation from one of NASCAR’s most respected builders of Ford engines.“I didn't really have any passion”: Mark Martin after NASCAR retirementIn Kenny Wallace’s recent YouTube video, Mark Martin reflected on the emotional void he experienced after retiring from racing, admitting that he struggled to find a new purpose that matched the passion he once had for being behind the wheel. The 66-year-old former driver is currently managing his automobile dealerships in Batesville, Arkansas, and working on building and designing custom motor coaches.Here's what Martin told Wallace on YouTube:“After I retired, I didn't really have any passion, and it took me a while to find some passion like I had about race cars. I bring some things to the table, and then together we build something that is just magnificent. After two years, I start thinking about building a new one. And there’s a waiting; there’s a line for my old coaches."Mark Martin is regarded as one of the greatest NASCAR drivers, even though he never won the Cup championship. He ended his three-decade-long career with 40 career Cup Series victories, 453 top-10 finishes, and 56 poles. He was inducted into the NASCAR Hall of Fame in 2017.