Injecting can help get seasoning deeper inside. Many kits out there but many swear by Fab P http://store.theingredientstore.com/fab-p.aspx but it has MSG. I find buying non injected pork(read the label, 10-15% added water is a bad sign) helps with flavor. Also after pulling mix some rub into the meat. Butter injection, make a tea from your rub and strain out the solids and inject it, inject beer or wine, all can add flavor.