Between '94 and '00, and excluding the viggen, the 900/9-3 was all T25.
If you wanted to install a TD04, you can. just make sure you buy all the lines, the intake pipe, and the PVC return pipe/hose.
It's really the best bang/buck option. Also, the most-reliable unit.
2008 9-5 Aero-1995 900T 'vert