im browsing around ebay...(i know, i know) and find a T-28 for cheap, but the description is a little odd, along with im a little weary anyway. The ad has detailed pics, is there any physical way i can tell if the turbo is a T-28? Thanks!

I just bought a T28 for my 98 GSX and I compaired it side by side to the T25 I took out and the only way I could tell the difference between the two (aside from the face that one was spotless) is that if you looking into the T28 the intake you'll see that it has a much larger bore, remember that the T28 is built into a T25 housing so there should be no visual physical difference without closer inspection (ie. aside by side picture or being able to handle the turbo itself)

http://www.dsmtuners.com/forums/showthread.php?t=162880&highlight=determine+t28

Also, T28s will have a dual blade compressor side. Mine also has a thinner compressor inlet (as in the metal where the intake pipe clamps onto is thinner) than T25s.