So from what I have read, the Titan does not utilize an EGR valve, but rather leaves the exhaust valves open for the first part of the intake stroke. If the cats go back and start coming apart, they suck back into the motor, thus blowing it up. My local dealer mentioned they shouldn't go bad till about 80,000 miles and will throw a check engine light before they do. The guys at UpRev mentioned they can go bad at any mileage and it would be a good idea to get some long tubes right away. I have 80k emissions warranty, 60k on the power train, and if my motor tanks at 75k miles, am I going to be covered on the motor, or just the catalytic converters? I am seriously debating long tubes ASAP because of this! Opinions...?