had the same prob they didn hold up worth crap, at the time didn khow of a warranty so i just lived with it, waiting when i pull the motor and takong them to a good coating place, and the dont run them on a new motor is a crock, just what i wanted to do put old ones on, break in the motor then redo and change headers, if they wont stand the they need to lower the price, i buy the so called best to put probs in the past, but it dont always work out like that, i will buy another set but it will be the cheapest one they offer and i will get it coated myself:D
