I just finished swaping the manifold on my 2000 GT, (my everyday driver). If you still have your stock FRPP manifold on your car, when it cracks and leaks coolant. DO NOT buy the Dorman manifold. IT SUCKS! I bought it because it has a lifetime warranty and the Ford did not. I have never been so disappointed in a part. It is supposed to match OEM and does not come near. I noticed the smaller opening on the runners before installing, but thought it would be ok as it supposed to match OEM. After the install, it feels like a V6. With the Ford manifold when i hit 4,000 RPM, my car would tear a**. With this Dorman, it never hits a powerband, it is a disappointment throughout the whole RPM range. This manifold will starve your motor of air. I hope this saves somebody else from getting a headache.
I will be replacing with a FRPP manifold in the future screw the no warranty.
I will be replacing with a FRPP manifold in the future screw the no warranty.