Busch dedicated the win to team owner Joe Gibbs and also to engine suppliers Toyota Racing Development, about whom he's been critical in the past over reliability but who more than proved themselves at Fontana, a circuit just down the road from their US corporate headquarters.
"Can't say enough about all of Joe Gibbs Racing, everybody at TRD - we appreciate their support of course.," he said. "Finally we get the 'home' win for Toyota, finally we get a win for Joe. Joe, this one's for you buddy. I drove my butt off right there at the end. You know, what I always do!"
Dale Earnhardt Jr. was also happy with the outcome, as second place at Fontana propels him into a 12 point lead in the NASCAR Sprint Cup Series championship standings over Brad Keselowski - making 2013 officially his best start in the title battle that he's had in his Cup career.
"We were lucky there at the end and came in and got some fresh tires and that sort of fixed our mistakes and helped us to get a good finish," said the firm fan favourite. "We had a good car and had some wheel issues, but was real happy about how we finished and made it up. We had a good enough car to run there, and were happy to get the finish."
The initial timing results had put Kyle's older brother Kurt in third place, until a post-race review of exactly who had been where when the final caution came out put him down to fifth place. Even so, that's an impressive result for Busch and Furniture Row Racing, which is far from one of the traditional top Cup teams but one that has been growing in confidence since taking a chance on the controversial former Cup champion.
"We had to overcome a number of issues," Kurt explained afterwards. "This week it was getting into someone else's oil before slapping the fence and then being penalised for speeding on pit road. Though we never quit, and do the best we can to fight back, it sure would be nice to have a smooth race, something we haven't had this year!"
Kurt had even briefly taken the lead from his kid brother at the restart. “I had a chance to pass him for the lead on that final restart, and I took it,” he confirmed. "Normally I'd have followed him, pushed him and drafted with him and tried to break away from the field.
"But I went to his outside, and it was a move that held him up, took his momentum away and gave me a shot for clean air," he continued. "The car just was a little tight on that top-side, couldn't quite get the power down and couldn't get in front of him and Logano to seal the deal.They were fast, and that was my one shot to win."
It's certainly a strong finish for the Busch brothers to the first five races of the Sprint Cup season, which now has a brief hiatus for the Easter break before resuming with the Goody's Fast Relief 500 at Martinsville on April 7.
Full Auto Club 400 race results
Post-race Q&A with winner Kyle Busch