Place chili powder, garlic powder, sugar, salt and pepper in a jar; shake to blend. Rub spice mixture onto pork tenderloins. Cover tenderloins and refrigerate for 2 to 24 hours.

Prior to grilling, melt apricot preserves in saucepan over medium heat. Remove pan from the heat and stir in remaining glaze ingredients. Place half of the glaze in a serving bowl and hold for service.

Prepare grill at medium-high heat. Grill pork tenderloins for 15 - 20 minutes, or until the internal temperature of the pork reaches 160° on an instant-read thermometer.

When approximately 4 minutes of cook time remains, brush the pork tenderloins with the apricot glaze remaining in the pan. Cook for 2 minutes, turn pork tenderloins and brush glaze on other side. Cook for an additional 2 minutes. Remove pork from the grill and let set for about 5 minutes before slicing. Serve with reserved glaze.