#2 they don't flow as good as headers which means less horsepower
#3 they look crusty and rusty
We all know what we are getting into when we buy headers but we buy them for a reason. Better flow,more torque and horsepower, and in case of ceramic or chrome headers they look much better than manifolds. Now if the car is just something to drive instead of tire ripping, cammed, worked up motor then fine the stock manifolds are good because that's it the motor is stock.
