If you have an LS with a greddy bolt on turbo what would be a good exhuast manifold, downpipe, cat, and cat back setup? I want to be able to use a Tial wastegate and a Thermal 3" exhuast... what should the other peices be?

 

Thermal 3" or custom 3" piping with a 3" muffler would be good. Thats what I did and I used a Magnaflow muffler. The Greddy turbo kit has an internal wastegate so you will have to do a lot of customizing to use the Tial wastegate.

 

Is there any good exhuast manifold upgrade for the greddy turbo? If so, or if not, what downpipe should I go with? What 2.5" downpipe is available? I want to keep AC so i'm not gonna go any bigger.