My 1999 was built in 11/98. I've read some posts on the fact that the fuel cross-over tubes going to the injectors were only good for one torque on the 98. 5's. But when exactly did they put the better tubes in our engines. Since mine was made in 98, I just wonder if the bad tubes somehow found their way in my engine. Just trying to investigate all that I can. Anyone have any idea, or was it based upon serial numbers... Thanks.