This is the view of the ATS housing from under the hood! Another view comparing them. The difference in the exhaust port is enormous!! 3.25" vs abit over 2.5" AND NO EBV!!! This is the exhaust up-pipe inlet,,no difference in size. Outlet for the "Y" to the CAC is much bigger.... And the later model intake plenums compared to the early models. And the MONSTER 4" Down Pipe compared to the stock one!! SHEESH,,,