I sent Perrin an e-mail last night about their new mounts. This is what I got back:
Dear Perrin,
I'm looking at tightening up my motor and transmission now that I've added a significant amount of power to my 05 Subaru Legacy GT. I was all set to go with Group N mounts but then found out about the new Perrin mounts. Have some questions that I hope you can answer!
Part numbers I'm interested in:
Engine mounts - PSPDRV050
Trans mount - PSPDRV150
1.) These will work in my 05 Legacy GT, correct? My GT is an EJ engine. Just want to make sure 
as the 05-09 Legacy GT was not listed on the "compatibility" page.
Both parts will work on the 2005-2009 LGT, I'll notify my web guys that a correction needs to be made.
2.) Would you say these are the same NVH level as the Group N or maybe a little more or less?
NVH will be about the same to a little less than Group N.
3.) Do you have both the engine and transmission mounts in-stock?
Yes we have both in stock.