In a small bowl combine the chili, chipotle, and garlic powders with the salt and pepper.
Trim any loose pieces or extra fat from the pork and rub it down with the lemon juice.
Coat the tenderloin with the spices, seal it inside a bag, and place it into a water bath at 133ºF for at least 1 hour and up to 3 hours.
When the tenderloin has finished cooking, remove it from the bath, and pat it dry with a paper towel.
To finish on the stove: sear it in a hot pan with a little olive oil for 2 to 3 minutes on each side.
To serve: slice the pork into rounds around an inch thick.