Help With Clicking Noise?

Hey - did you drain the oil and check for metal shavings? If you didn't find any metal shavings I would put your car up on some jackstands and listen/feel near the exhaust manifold for leaks. That sounds louder than normal for an exhaust leak, but you never know. If your exhaust manifold gasket is blown it can put up some serious noise - but the noise would increase tremendously at WOT.