99 Cougar V6, MTX

When the car is under load, 3000-4000RPMs I can hear a clicking or tapping, this only happens when in gear(thus under load) and only once the car has warmed up to operating temp. Engine has about 52k on the clock. No noticable reduction of performance. The sound may be audible sitting still but its hard to differentiate from injector clicking. But if I were to guess its coming from the Passenger Side rear of engine, although when I'm driving I hear it primarily out of the driverside window(but then again I'm closest to that window)
Car just had a fresh oil change(clicking was there a couple days before)
I've searched and found a few posts on this same thing, but with multiple possibilities.
So if you have any ideas let me know..


99 Cougar V6 Tourmaline Green: MTX, KKM, Borla Dual...