Its possible the fuel filter is dirty, it hasn't been changed in a long while. Does seem to rev a bit easier.. so I guess its a bit of an upgrade. However, maybe because I'm already running a LW flywheel and LW pulley that I'm not noticing much of a difference?

Car was seafoamed about 1 week ago, didn't get any black smoke. This is the 2nd time its been done with the same result, so I'm pretty sure my engine doesnt have much carbon build up. Air filter is brand new as well as of 2 weeks ago.

Exhaust is in great condition, new CATS as of 1.5 years ago, new muffler about 4 years back, and new mid pipe about 6 months back. O2 sensors are both brand new as of 1.5 years ago. So.. everything is pretty new.

The fuel filter is a possible suspect.. maybe I will need to check into that.