the par gearset is supposed to be sick... although it's not exactly a streetable mod... it should be great for a drag only car...
Also keep in mind if you're not tearing apart trannies as it is it's a worthless expensive p.i.t.a. mod...
Oh and i'd search google if I were you...
http://www.mrtrally.com.au/forums/to...?TOPIC_ID=7041
one guy on there threw his par gearset in the GARBAGE because it cost him so much in having it removed and shipped back and forth SEVERAL times... although even he mentions that it was the first line of gearsets they came out with for the WRX and the newer ones were supposed to be better...
Turbo magazine put one in a S-ER which has the sr20 motor in it but is MAJORLY handicapped by it's weak tranny...
I'd check that article out if you can it's really informative... ish.