EDIT - Never mind - I didn't read your post right ...I see your just looking for the muffler.
If I were you I would call Kenny McNiel at AWE and talk to him. I bought my set-up striaght from him (through my mechanic) and had it in about 4 days. I'll be at his shop later this week if you want me to follow-up.
www.awe-tuning.com