Air Lift LoadLifter 5000 Ultimate Rear Air Spring Kit for 06-17 Ford E-350 Super Duty XL/XLT Floor Mats>Floor Mats - Rubber 4" 409 Stainless Steel Construction:

4" 409 Stainless Steel Construction: This cat-back exhaust system is constructed of 4" mandrel-bent 409 stainless steel tubing for maximum strength and durability

producing a flatter flow curve

BAR or kPa (PAS) -See your boost in the units you prefer

Once you install this awesome exhaust manifold

providing the ability to air out 137mm from stock

Air Lift LoadLifter 5000 Ultimate Rear Air Spring Kit for 06-17 Ford E-350 Super Duty XL/XLT Floor Mats>Floor Mats - Rubber 4" 409 Stainless Steel Construction:LoadLifter 5000 ULTIMATE adjustable air spring kits feature all of the benefits of our heaviest rated air spring with the addition of an internal jounce bumper inside the spring for the ultimate in ride comfort. An Air Lift exclusive product! Fits vehicles with in bed hitches. Tow and haul the heaviest loads with safety and comfort with LoadLifter 5000 ULTIMATE. Works with vehicle's leaf springs to provide up to 5,000 lbs. of rear load leveling