On Thursday, he decided to end the recruiting process and told Inside the Auburn Tigers he will sign with Auburn in Febrary.
He is the third high school junior to announce that he will sign with Auburn in 2007. Offensive line is expected to be a priority position in Auburn's next signee class.
"I picked Auburn because I have liked them since I was young," Coulahan says. "They are recruiting me to play offensive tackle and I am excited about the program. I feel it is a good fit for me."
"I'm being recruited from pretty much all of the SEC schools," Coulahan notes. "I just got back from LSU this weekend and I talked to Les Miles.
"I talked to all of the coaches," he says about his visit to Baton Rouge. "I sat down in Coach Miles' office and had a conversation with him, my mom and my dad. We watched the scrimmage and they had a picnic. And they showed us around the facilities and everything."
Even though he had a good time at LSU, Coulahan says the Bayou Bengals were second on his early list of favorites. The only other school he has been to this spring, Auburn, finished at the top.
"I haven't really seen the academic center and I haven't really seen the weight room and everything," he says about Auburn. "I haven't seen all of that yet, but I've been to a camp (and scrimmage). I've seen the campus and I really like it. That's where I really want to go is Auburn."
Coulahan, who bench presses 310 pounds, cleans 315 and squats 500, played last season as a junior at West Florida High School where his team went 0-10. He transferred after the football season to Pensacola Catholic and expects to have a more successful senior year.
"I had about six sacks and 60 tackles from defensive end," he notes about last season. "I had either 25 or 22 tackles for a loss. I transferred to this new school and the academics are a lot harder."
Coulahan says he is in good shape academically and that he is interested in majoring in fisheries or wildlife management.
He is scheduled to start for a fourth consecutive year in high school. Coulahan says he isn't playing any other sports so he can concentrate on football and academics his senior season.