Titanium is a braging rights thing more than anything else. The difference in weight between the Buschur Racing setup and a titanium setup is a whopping 4 lbs. !!! I use the high flow cat that came with the Buschur Racing turbo back setup... not sure if it is the best, the worst, or somewhere in between, but it sure quiets the system down a lot and dosn't impact the power very much.