The trim is just a Ratio, really. A lot of people use it as the "size" of the turbo... but there are a lot of factors that go into the sizing of a turbo. Compressor Housing A/R, Turbine Housing A/R, dimensions of the wheels, etc.
You want JUST the turbo? Your manifold and current downpipe won't work with it, unless you get a new hotside for it (since I'm assuming you have a T3 Flanged turbo now). It wouldn't be hard to do though.
gt30, my turbo is shittin out on me, i took my boost gauge and hooked it up to the turbo to measure the boost to see if i had a boost leak and i was pushin a couple psi more then what i was gettin from the intake manifold, so turbo is crap. i wouldnt mind takin your whole kit, but im short on it right now. but if i do get the turbo im aware that the downpipe will have to be redid and id need a new manifold
oh, well if sale falls thru let me know. all i really need is the turbo, manifold and downpipe. if youre willin to seperate, i got a G in hand and we can negotiate. good luck wit the sale tho