Do it! And while you're at it, swap over all T5 specific parts and do a TCS delete. Mike D said its pretty easy. I had Jordan at eEuroparts do my 1995 9000 Aero and its works perfectly.
1995 9000 Aero - Jordan Pagano tuned 390hp
2002 9-3 Viggen vert - Jordan Pagano tuned 300hp
2004 9-5 Aero Wagon