A New problem just appeared today

Kaiser370z

Hi guys
my Z has 130k miles on it and installed some boltons except headers ( still running oem headers and the headers cats still on too ) and NST pulleys

anyway today I was hanging out with my wife and everything was fine
I decided to give it a full throttle and I did
after I slow down, I stopped in a gas station and I noticed some noise
I tried to listen carefully to know where that sound come from but it's really hard to tell but I think it's not from the head or inside the engine
I felt that it is from a pulley or something like this
it feels like coming from the bottom front section from the engine

I don't know what it is exactly
anyone have any idea ??

BTW the noise sounds like ticking in idle and if I increase the RPM, the ticking gets faster and faster