I was referred to this place by another member. Still havent gotten it done yet, but I was told that they have done it and did a really good job.
From the other member:
Best Muffler. It's located in La Crescenta/Glendale area, the guy has experience with this so that's definitely a plus. Here's the address:
3947 Foothill Blvd.
La Crescenta, CA 91214