Currently running a 2007 SS/SC Injen CAI, just ordered a Corsa Cat-back (touring) and GMPP Extrude Honed Manifold, but the Manifold is back-ordered til an unknown time. Most "Header(s)" I look at for my car say "Off Road Use Only" some state "Not 50 State Emission Legal" So has any 1 had problems using say Weapon R or anything like that when doing like a full exhaust upgrade. I heard I wont pass my yearly inspection so I wasnt sure about doing the full exhaust. Any information would be greatly appreciated. Thanks in advance~

 

As long as you have a cat on there, you should be just fine. And if you throw a code, you can have it turned off with HPtuners. Forget about the GMPP "header" and get a real one.