what are the symptoms of actually running out of fuel pump or injector?

[thor'svr4]

The car does slow down a little once i get to 6,000rpm but i'm not sure if i would have described it as hitting a wall. Then again i don't really know what fuel cut feels like so for all i know the slight loss of power up top is from fuel cut. When you hit fuel cut will the data-logger show IDC's dropping to 0% due to fuel cut or still at 110%?

theres no noticeable exhaust leak but since exhaust gaskets are cheep ill just replace them all.