RTEC43010 / 43010 - Application Notes 97-04 Buick Regal 3.8L - 3" Inlet - 2-1/2" Outlet 03-05 Chevrolet Monte Carlo 3.8L - 3" Inlet - 2-1/2" Outlet 03-05 Chevrolet Monte Carlo 3.8L - 3" Inlet - 3" Outlet 97-05 Pontiac Grand Prix 3.8L - 3" Inlet - 2-1/2" Outlettlet