Rinse turkey thoroughly under cold water, then blot dry with paper towels. Place on a greased rack of a roasting pan. Set aside.
Prepare the injection solution in a saucepot, whisk together the turkey stock, honey, olive oil, smashed garlic, Worcestershire sauce, Smoked Salt & Pepper Rub and chili flakes. Add in the thyme sprigs and bay leaf.
Bring mixture to a boil, then simmer for 5 minutes. Remove from heat, cool for 30 minutes, then strain.
Using an injection needle, inject the solution throughout the turkey. Rub 1 tablespoon of solution over the top of the turkey. Add water to the bottom of the roasting pan. Set aside.
Fire up your Pit Boss pellet grill on SMOKE mode and let it run with lid open for 10 minutes then preheat to 450°F. If using a gas or charcoal grill, set it up for high heat.
Transfer the turkey to the grill and roast for 100 to 120 minutes, until an internal temperature of 165°F is reached, rotating every 30 minutes. Tent with foil after 30 minutes, then brush all over with Sweet Heat BBQ Sauce during the final 10 minutes of roasting time.
Remove from the grill, and allow the turkey to rest for 30 minutes, then carve and serve warm.