darkhorse02gt - the most likely reason that your check engine light is getting thrown is the front o2's are not hot enough. when you put l/t's on, the o2's position is moved farther down from the engine. a o2 sensor has to be at a certain temperature to work properly, so when you move it down farther it takes longer to get hot enough. as a matter of fact mine just came on because of the same reason, just drive it for a day or 2 & it should go off by itself
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Its the rusty thing bolted to the upper intake. There is pipe that goes from there down to the driver's side exhaust manifold/header, whichever you have.
i'm not exactly sure i can't remember, cause i did this on my last gt, sorry , if ya want i can see if they can pull up my old receipt this wednesday when i'm off, just let me know as for the measurements i have no clue
darkhorse - more or less yeah it'll make you run a bit rich , no biggie