Check out www.msr-usa.com . I'm running one of these systems and it's amazing! Only bolt on system made for the Legacy turbo that I know of!

 

I did have pictures but the site is down that was hosting them. I'm working on hosting them somewhere else. The sound is absolutely amazing! Very nice low rumble at idle that aggressively roares to life at 3000+rpm. Everyone that has heard it can't believe how good it sounds. I'm running the "street" edition which comes with a high flow cat and resonator. If you get the "race" edition it comes with a test pipe(straight 3" pipe with flanges) that bolts in where the cat goes so you can get a cheap cat and bolt it in for emission tests then remove it afterwards and put the test pipe back in. It also doesn't come with the resonator so it has a very aggressive sound. MSR/C.E.S. will do custom orders though too.
If you pm me your e-mail i can send you pictures of it installed on my car.
-Matt

 

You've got mail. Let me know what you think.

 

Here's the pictures

 

I got a new CES Racing Legacy semi-race TBE to replace the street edition that I'm currently running. Here are some pics:

http://thawa.net/images/legacy/legacy92ej22t/