NAVISTAR issued a recall on the 9900, PROSTAR, and LONESTAR models

On certain vehicles, the weld joint between the upper stack tail pipe and the vertical exhaust pipe may crack and allow the exhaust pipe to separate from the vehicle. The pipe falling on the road surface could create a safety hazard potentially resulting in a crash causing injury and/or damage to property. Correction: Dealers will replace the stack tail pipes with an approved replacement part.