If you are looking for a cajun injection this one has served us well:
2 sticks butter
2 Tbsp garlic juice
2 Tbsp onion juice
2 Tbsp worcestershire sauce
1 Tbsp lemon juice
1 tsp cayenne
2 Tbsp crab boil concentrate (I use Zatarains)
If you have a juicer use it to make the garlic and onion juice. Heat up recipe to get all ingredients mixed well.
Inject and let set in frig for at least 4 hours over night is better.
This will do 12 to 14 pound bird.
Rub the outside with season salt or rub of choice.