"It's just fantastic," said Wilson, once he'd been given directions to victory lane - an unfamiliar location to him at an oval track. "I just can't believe we managed to pull this off. The car was fantastic. And on the long runs, it just got better and better. I saw people sliding around and knew I just had to hit my marks.
"It was four-wheel drifting all the way into turn 3 and all the way out of turn 4," he added. "You were having to hang on out there." And no one did it better than Wilson, to claim his first IndyCar win since Watkins Glen in 2009 and Dale Coyne Racing's second series victory, Wilson having previously driven them to victory lane at Detroit in 2008.
Ryan Briscoe was unable to capitalise on the wounded Ganassi car in time and had to settle for third place - but he wasn't unhappy about that.
"I had the lead, I just didn't have the car to bring it home and stay in front. It's disappointing but I had a huge moment out there at one point tonight and I'll take third," he said. "Man you just had to hang on. It was hard work. My car, the last two sets of tyres just went off really badly in the back, so I was battling a loose car, which is hard work. I'm glad the race is over!"
James Hinchcliffe held on to fourth place ahead of JR Hildebrand, who had survived a spectacular slide in the opening laps but after that had settled down to a strong run that just somehow lacked that final killer edge to make a play for the outright race win.
"Starting from 23rd or 24th or wherever we started, I'm definitely happy to come home with a top five," said the Californian. "The last few stints it was super loose, but we're able to keep the speed up enough to not lose a lot of laps or positions, and when the car was good we could just hammer on it and catch it all back up. We would have liked for the car to be a little more competitive at the end of the runs, but shoot man, we'll take it."
Simon Pagenaud recovered from his early drive-thru penalty and going a lap down to finish in sixth place ahead of Castroneves. For a sportscar road course specialist, the Frenchman had not only proved surprisingly adept at the oval challenge, he'd enjoyed it too - as physical as it had proved.
"Man, I enjoyed it actually - I didn't think I would that much," he admitted. "I love the high side when it works. It's cool. I was very comfortable in turn 1 ... Once I got the hang of it, I had a really, really good race car. It was blindingly fast. I kept adjusting all race long."
If it hadn't been for that early mistake in pit lane, Pagenaud fancied that a win hadn't been too far out of reach: "Unfortunately, I made a big mistake in the pits early, which cost us a lot," he said. "Otherwise, maybe, we could fight for the win. The car was that good. But, I'm catching on. I learned a lot tonight, I made some good passes. Hats off to the guys."
But the night truly belonged to the Brit firing off the handguns in victory lane. You couldn't miss him: not only was he sporting a massive great Stetson, he was also wearing the broadest grin in Texas on Saturday night - and deservedly so.
Full race results