The 29-year-old speed merchant made it a debut by roaring to victory – after being narrowly denied a second podium finish of the season earlier in the day.
Having started his MacConnal-Mason Gallery supported Porsche 911 GT3 from eighth place, the Dumfries driver crossed the finishing line fourth, a mere 0.315secs behind the third-placed car in the 47-mile opening race.
But it was a different story in the second race of the day. Wylie made a blistering start from the outside of the front row to lead at the end of the opening lap by 1.2 seconds.
He extended that to 2.4 seconds but championship leader Harry King overtook him at mid-distance.
However, Wylie was back in front four laps later when King suffered a puncture and cruised to an untroubled 4.5 seconds victory after 20 laps.
Wylie remains sixth in the championship standings but is now only 10 points off third place, ahead of rounds 11 and 12 at Silverstone this weekend.
He said: “I’m delighted to finally get my first Porsche outright victory.
“Thruxton was a bit of an eye-opener. It’s incredibly fast and unique. But I loved the experience and, after my victory, it’s firmly up there as one of my favourite tracks!
“The In2Racing guys again provided me with a great car and I’m indebted to MacConnal-Mason Gallery for its support. My aim is to keep the momentum going as we head to Silverstone this weekend, knowing I still need to work on my performance in qualifying.
“As I proved in Race 2, starting at the front is the key to a top result in such a closely fought one-make series.
“I’d just missed out on a podium in the opening race, so I was very hopeful of good pace in Race 2.
“I made a good start off the line, which was obviously critical.”