aFe Momentum HD Pro Dry S Air Intake Systems 51-74003 Catalytic Converters Factory couplers become brittle with

Factory couplers become brittle with heat and develop cracks that bleed boost

A4 QUATTRO

No permanent modification required for most trucks

Slide the protector over the spark plug boot before installation or route it over the existing boot

Each coupler is multi-ply silicone with embedded reinforcement that resists ballooning at 40+ psi

aFe Momentum HD Pro Dry S Air Intake Systems 51-74003 Catalytic Converters Factory couplers become brittle withThis aFe Momentum HD air intake system (part 51 74003) is a complete intake upgrade with part number 51 74003. It replaces the factory air box and snorkel with a free flowing design that drops intake air temperatures and increases volumetric efficiency. The sealed air box system engineered for heavy duty diesel applications, drawing cool outside air through a dedicated inlet tract, while the engineered intake tube delivers higher velocity airflow to