I believe you meant to say titanium cat back. The manifolds are cast iron like all the rest. The titanium cat back is a good set up. Light weight , good flow. I still have mine with a set of Kooks headers. Plenty loud. Lot of guys change it out for a different sound I guess. As far as a Z06 sitting lower, not true. I had to lower mine,it was a 4x4 when I first got it.