Dieselr Aluminized Cat Back Exhaust Single | Dodge 2500/3500 5.9L Cummins 2004.5-2007The Dieselr Aluminized 4,5" Cat Back Exhaust (2004. 52007) is built for durability, precision fit, and smooth exhaust flow. Crafted from 4 inch , 5 inch heavy gauge aluminized steel, this system reduces backpressure, stabilizes EGTs, and delivers consistent performance for high load or daily driven diesel builds. Each Dieselr system is precision welded and mandrel bent to maintain uninterrupted flow from the catalyst outlet to the tail section. The