High flow replacement cats?
Le Mans Master
Joined: Dec 2003
Posts: 7,457
Likes: 144
From: NC
I had some bolt on's when I had my LS2 but don't know if they work on the LS3 or not. They were made by Random Technologies. Didn't really make much difference but it did sound a little different.
Melting Slicks
Joined: Oct 2006
Posts: 2,228
Likes: 5
From: Gainesville Georgia
Also check Metal Matrix. They should be available for the LS3, I don't see why they wouldn't be. I know they are one of the best if not the best flowing cats from what I've read. Good luck 
