I've noticed a new oil leak and I can't find where it is coming from. From the top of the car, it is not visible. From under the car, oil is leaking on the parts right before the passenger side Catalytic Converter. I've included a photo taken from under the car when I had it lifted to replace the muffler. Any help/recommendations would be great! I'm kind of an amateur at fixing my own car. The most that I've done is replace my own brakes/rotors and install a plenum spacer. (2004 G35X Sedan)

 

Did any of the bolts around the oil pan loosen up?
Check them!

 

Jack up the car, remove the plastic under cover.
D
Dye​​​test and a black light with a good inspection mirror. Pour it in get the black light going and look around with the mirror.

 

I have checked the pan, however, it is not coming from the pan. It is coming from the engine, I am thinking the leak is located under the spark plug-coils location on the passenger side.

 

That looks like valve cover gaskets to me. Pretty common for them to leak on these cars, more so now sense these cars are aging.
I thought mine were bad, BUT it turned out that the O-ring's on the cam position sensors were bad (where that green connector on the back of the cylinder head plugs into). My VC weep a little oil, but the majority of my leak was in fact those o-rings.

 

It was definitely the gaskets. However, I replaced the valve covers and gaskets. Broke 2 bolts doing so but I made it through!