No, there is no 5" downpipe for an 03-04 truck. If you want to run a 5" downpipe, then you will need to replace the cast iron elbow & clamp with a newer one from an 05-06 model. Then purchase a 5" downpipe for an 05-06 truck & it will bolt up to the new elbow. The newer model trucks run a true 4" elbow & downpipe where as the 03-04 models run a 3 1/2" elbow.
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