Hello, i was wondering if the 12MM COLD AIR INTAKE MANIFOLD INSULATOR TO SUIT ALLOYTEC VZ-VE 3.6L V6 and 25MM COLD AIR INTAKE MANIFOLD INSULATOR TO SUIT ALLOYTEC VZ-VE 3.6L V6 fits on my 2004 cadillac cts 3.6l.

The 12mm item will fit your CTS (we even have fitting instructions for these to suit), however we haven't conducted a test fitment on the 25mm version. I'm optimistic that the 25mm manifold insulator will fit, however we would need your help to confirm by taking a few measurements around the manifold.