This is nowhere near a 5-alarm chili, it barely rates 2-alarms. If you're preparing this because someone has told you they like very spicy food, this won't even register. Also, adding more cayenne overwhelms the other flavors, so you're best to limit it to 2 teaspoons and then add in some peppers which are actually hot. Start with habanero and scotch bonnet peppers, and if those aren't enough, shop around at specialty stores for Scorpion Butch-T and Naga Jolokias. They're becoming more common and easy to find.