I have read many posts of guys here recommending cats from timevalve.com.
I did a search on timevalve, and there are lots of threads.
Here is one:
Exhaust from Adsit or TimeValve?
2001 E430, Bourdeaux Red, Oyster interior.
1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".