Any luck with the install? Was it your headers? I have this issue with my fabspeed header that I installed. After install it was running fine, but after a long drive it started to tick, I re-torqued all the header bolts. The ticking still continues, Changed the oil, thought it might be headers, but still there, Thought might be the plugs, they seemed loose, but replaced both banks anyways. seems to have quite down just a little bit, but still there. I heard it with the stethoscope, seems to be coming from injectors. couldn't find much on noisy injectors, any input would be appreciated.