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Did you put all the accessories on or did you have someone else do it? Are all the boost tubes tight and not leaking? Are the up pipes sealed correctly on the manifold and at the turbo? Did you put in an EGR delete? Did it come with a new up pipe or a plug? Everything plugged up as far as connectors go?
I did mine a few days ago. A certified master tech at a dealership had done it before and left a few crucial things out. The previous owner had the work done, EGR delete, 4" TBE, SCT, Studs and gaskets... He didn't mill the heads. I ended up stripping it down and doing it right. The truck runs stronger now than ever. Same tunes and no other mods other than the original ones it had when I got it. The up pipe on the pass side wasn't even bolted up at the manifold.
As far as reducing backpressure goes, it don't work like a gasoline engine. Did you keep the cat? What kind of exhaust are you running?
05 CC FX4
Leveling kit, 35/12.50/20 M/Ts on Rockstars
4" TBE, studs, EGR delete, Black Onyx gaskets
S&B, SCT TSX with custom tunes