AEM Universal Stainless Tall Manifold Bung Install Kit

AEM Universal Stainless Tall Manifold Bung Install Kit (Part #30-4008)

Protect your oxygen sensor with the AEM Universal Stainless Tall Manifold Bung Kit. Features a finned, tall design to enhance cooling and prevent flow restrictions.

The AEM Universal Stainless Tall Manifold Bung Install Kit (MPN: 30-4008) is engineered to meet the extreme thermal and mechanical demands of high-performance and forced-induction exhaust systems.

When operating under boosted or high-horsepower conditions, extreme exhaust gas temperatures (EGTs) can significantly shorten the operational life of sensitive wideband oxygen ($\text{O}_2$) sensors. The elevated design of this weld-in stainless steel bung recesses the body of the sensor out of the direct flame path. By preventing the sensor tip from intruding deeply into the exhaust runner or downpipe, it eliminates unwanted air/fuel stream restrictions and turbulence.

Constructed from high-grade, corrosion-resistant stainless steel, the bung features an integrated finned heatsink ring that dissipates excess thermal energy. This design protects expensive sensor electronics from heat soak, ensuring accurate, consistent sensor readings and long-term durability on street, track, or race setups.

Best Uses

1. Forced Induction Systems: Ideal for turbocharged or supercharged setups where high exhaust gas temperatures rapidly degrade standard sensor bodies.
2. Wideband  Sensor Installation: Purpose-built for installing UEGO sensors, multi-channel wideband monitoring systems, or exhaust gas diagnostics.
3. Custom Exhaust & Manifold Fabrication: Perfect for weld-in mounting on aftermarket manifolds, headers, test pipes, and downpipes.
4. High-Performance Tuning: Essential for race cars and tuned vehicles requiring consistent, accurate air/fuel ratio (AFR) data without sensor thermal failure.

Features

1. Tall Standoff Profile: Recesses the sensor to minimize tip intrusion into the exhaust path, preserving optimal flow dynamics.
2. Integrated Finned Heatsink: Finned exterior acts as a passive cooling heat sink to lower sensor operating temperatures.
3. Stainless Steel Construction: Built from durable, rust-resistant stainless steel for reliable welding performance and long life in harsh environments.
4. Universal Weld-In Design: Curved base contour makes it straightforward to weld onto standard exhaust tubing and custom manifolds.
5. Precision Threading: Machined to fit standard wideband oxygen sensor thread dimensions cleanly without galling or cross-threading.

Benefits

1. Extends Sensor Longevity: Prevents premature wideband sensor failure by protecting internal electronics from extreme heat soak.
2. Prevents Exhaust Flow Restriction: Reducing tip protrusion inside the pipe maintains smoother exhaust gas scavenging and reduces backpressure.
3. Improves Air/Fuel Tuning Accuracy: Stable sensor operating temperatures deliver repeatable, reliable AFR data for safer engine calibration.
4. Corrosion and Thermal Shock Resistance: Stainless steel build withstands repeated high-heat thermal cycling without degrading or cracking.
5. Cost Savings Over Time: Reduces the frequency and expense of replacing costly wideband  sensors damaged by excessive heat.