Bellmouth Velocity Stack Aluminum (5in Inlet O.D

The VIBRANT PERFORMANCE Bellmouth Velocity Stack Aluminum with 5-inch inlet O.D. is a precision intake component engineered to optimize volumetric efficiency in high-performance engine applications. This naturally finished aluminum velocity stack features a bellmouth design that smooths air intake transitions, reducing turbulence and promoting more laminar flow characteristics into the intake manifold. The 5-inch inlet diameter accommodates mid-range displacement engines while the 8.75-inch outer diameter bellmouth profile provides effective air velocity recovery across the operating RPM band.

Constructed from lightweight aluminum, this velocity stack reduces inertial mass while delivering the flow-tuning characteristics demanded by naturally aspirated and turbocharged engine builds. The bellmouth inlet radius is precisely contoured to minimize boundary layer separation and maintain charge velocity stability—critical factors in maximizing effective intake duration and volumetric efficiency at peak power. At just 0.5 lbs, this component adds minimal weight to the induction system while contributing measurable gains in air charge quality.

This velocity stack is ideal for engine builders, performance tuners, and motorsport enthusiasts optimizing intake manifold design for dyno testing, competition engines, and street performance builds. The 5-inch inlet accepts standard intake piping and filter assemblies, making integration straightforward in custom intake systems. VIBRANT PERFORMANCE is recognized in the automotive performance market for precision-engineered induction components that deliver consistent flow improvements without sacrificing fitment or durability.

Velocity stacks are foundational tuning elements in intake optimization. Unlike simple intake tubes, a properly sized and contoured bellmouth stack creates a pressure-recovery zone that stabilizes air velocity entering the manifold, reducing intake reversion and supporting more complete combustion events. This VIBRANT PERFORMANCE design delivers measurable repeatability in flow-bench testing and real-world dyno validation across mid-range displacement platforms.