Dieselr Aluminized 4" Cat Back Exhaust Single | GM 2500/3500 6.6L DURAMAX LB7/LLY/LBZ w/OEM 4 Bolt Flange 2001-2007The Dieselr Aluminized 4" Cat Back Exhaust (20012007) is engineered for performance focused diesel platforms equipped with a factory 4 bolt flange connection. Built from 4 inch heavy gauge aluminized steel, this system enhances exhaust flow, reduces restriction, and provides consistent performance under high load conditions. Each Dieselr exhaust is mandrel bent for precision airflow and TIG welded for long term structural strength. The aluminized
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Dieselr Aluminized 4" Cat Back Exhaust Single | GM 2500/3500 6.6L DURAMAX LB7/LLY/LBZ w/OEM 4 Bolt Flange 2001-2007