The Aluminized features "All Bed, All Cab" fitment, mandrel
bent aluminized steel tubing and straight-through aluminized muffler. The MagnaFlow
Black Series features "All Bed, All Cab" fitment too, but with mandrel bent
stainless steel tubing and black coated stainless steel tailpipe and tip. (www.MagnaFlow.com/diesel)