Since then, the 6-foot-4½ Williamstown (N.J.) High offensive lineman has transformed his body, adding 30 pounds and increasing his bench press by 50 pounds.
"Just eating right and working out," the 248-pound Kowalski said. "I feel like I've gotten a lot stronger from my last season going into now. That was the most I ever lifted, or trained this offseason, to get to where I'm at right now."
He is looking for his first FBS offer, and interest from Rutgers and Pittsburgh picked up this spring. He is camping at Rutgers, and going in with the mindset of earning an offer.
"I feel like I have to perform well at camps," Kowalski said. "I know game film is great and all, and they love to see how well you played, but I know a lot of coaches love to see you perform live. That's what I'm going to do and hopefully get an offer from Rutgers."
He was on the Rutgers campus in February for a combine, and got a quick look at things.
"I saw the facilities up there, and it was real nice," he said. "Academically, I know a little bit about the school. Not a lot off the top of my head."
But the camp circuit will give Kowalski the opportunity to showcase his new body, and his new strength.
He increased his max bench press from 270 to 320 pounds, and his squat went from 320 to 420.
"Some schools are looking at me as (an offensive) tackle, some schools are looking at me at defensive end, some of looking at me as defensive tackle," Kowalski said. "I honestly don't have a preference. I've been playing offensive and defensive line my whole life. I'm used to any position. Wherever the team needs me to play, that's where I'll play."