4.0 Inch Downpipe Back Single Stainless Steel without Muffler 2015.5-2016 GM 2500/3500 6.6L Duramax - SS871NM - Flo Pro Exhaust - 432019

FLO~PRO - BUILT IN ALBERTA FROM USA STEEL.

At FLO~PRO, every exhaust system starts with premium 16-gauge aluminized or stainless steel sourced directly from U.S. mills. Each bend, hanger, and flange is designed, welded, and finished in Alberta, Canada by tradespeople who actually build the real thing not a 3D-scanned imitation of it.

FLO~PRO continues to manufacture with North American steel, North American equipment, and North American standards. The difference shows in the fit, the weld quality, the longevity, and the performance you feel under load.

Choose the original, not the scan.
Built in Alberta. Made from USA steel. Horsepower you can hear.

KEY FEATURES
Manufactured entirely in Alberta, Canada
Formed from U.S.-sourced 16-gauge aluminized or stainless steel never offshore substitutes
Zero copycat parts
Pre-welded contour bends for a painless install
Canadian-fabricated hangers for true OE-level fitment
Stronger flanges, cleaner welds, and more consistent alignment than scanned clones
Lower EGTs and improved airflow thanks to real engineering