It's effectively stock. I assumed 15 was normal for NA but I guess not. My old '09 SAP CVPI with 3.27s managed a solid 20-25 in my town.
Luckily I live about an hour away from Mo's; I assume I just gotta give his shop the call and let him know what's up?
Now I'm getting a bit worried, considering how good of shape this particular car is in