I know what you're thinking... it's the valves opening/closing. I know what that sounds like and it isn't it. I have a 2000 Integra GSR with 68,000 on it. I have a skunk 2 pro series intake manifold, AEM short ram, DC 4-1 header, 2 1/4 exhaust. I am very meticulous in regards to my cars. I ALWAYS change the oil at 3000-3500 miles with Mobile 1 full synthetic. Also, I only use 91-93 octane fuel. While driving my car will make a louder than usual ticking sound coming from the engine compartment. However, it only happens between 2000-3000 rpm's and only under load. It doesn't do it at idle and if I am in neutral and rev to (say 4k) it doesn't do it. What do you think it is? Thanks in advance!