Ecu ground wire? and mystery wire cut (Need help!)
 

so i took off the tb and dynamic chamber to hopefully clean up the ecu ground and fix some stutter.. and everyone made it out to be that the "big" ground wire was obvious.. well.. is the ground circled in green that wire? The circled red part is my mystery wire.. the bolt holding the wire down is in the circle, back of motor passenger side above the o2 sensor, and thats about where the wire ends, looks like its cut, but its not the o2 as o2 wire itself runs beside it and is that greenish tint connector :o
http://i57.tinypic.com/308isex.jpg


it doesn't look like much if it is the ecu ground...and a close up
http://i62.tinypic.com/2aj57ox.jpg


and here is a close up for my mystery (ground?) wire.. (pretty sure its a ground as it is just bolted there, just not sure to where it needs to go
http://i62.tinypic.com/28vynas.jpg

again any help appreciated, thanks in advance!

Not familiar with FCs. but they both are obviously ground wires. The cut one likely goes to the chassis. You might just look along the firewall in that general area.
There's really no harm in augmenting the factory grounds and it's pretty easy and inexpensive. Get some large gauge wire and make a circle....battery to chassis; chassis to engine and engine to battery.
IIRC there should also be a ground wire somewhere downstream on your exhaust...at least there is on the FD. A braided ground strap from a flange to the chassis for the O2 sensor.

First 2 pictures yes thatsthe ecu ground wire in green, now the 3rd picture, all i see is either the gas pedal cable, or cruise control cable

To the right of the hose is the bolt for the wire, and right above the end of the cable you see the end of the snipped wire