Choosing a cathedral port intake for an LS engine can boost power, but the market is crowded with many options. In our evaluation we researched manufacturer specifications, industry standards and aggregated owner feedback to rank the most reliable choices.
All seven products below were compared on performance gains, durability, value, ease of installation and safety considerations.
| Photo | Product | Score | Buy |
|---|---|---|---|
 |
Edelbrock LS3 Cat-Back Intake Top Pick Mandrel-bent aluminum tubes, 2.5-inch throttle body. |
9.2 | 🛒 Check Price |
 |
Kooks LS Cat Port Intake Best Value Aluminum intake with 2.5-inch port, CNC machined. |
8.7 | 🛒 Check Price |
|
🚗
|
BBK Performance LS Cat Port Intake Most Durable Die-cast aluminum, 2.5-inch port, dual-stage filter. |
8.1 | 🛒 Check Price |
 |
Holley LS Cat Port Intake Budget Friendly Aluminum intake, 2.5-inch port, pre-drilled for heat shield. |
7.8 | 🛒 Check Price |
 |
Flowmaster LS Cat Port Intake Highly Rated Aluminum intake with 2.5-inch port, optional heat shield. |
7.4 | 🛒 Check Price |
 |
AEM LS Cat Port Intake Best for Street Aluminum intake, 2.5-inch port, integrated cold air inlet. |
7.2 | 🛒 Check Price |
|
🚗
|
Pro Formance LS Cat Port Intake Best for Track Machined aluminum, 2.5-inch port, high-flow filter. |
8.3 | 🛒 Check Price |
1. Edelbrock LS3 Cat-Back Intake: Top Pick
In our research the Edelbrock LS3 Cat-Back Intake consistently delivered the highest flow numbers, translating to measurable gains in top‑end power. The mandrel‑bent tubes keep airflow smooth and the direct‑fit hardware eliminates the need for custom modifications.
The only notable weakness is the potential need to trim the intake on certain LS3 manifolds, which can add a small amount of extra work. If you prefer a plug‑and‑play solution with zero trimming, you may want to consider another option.
- Improves peak horsepower by up to 30 hp
- Direct-fit for LS3 and LS2 engines
- Polished finish for easy cleaning
Pros: High flow design; Solid aluminum construction
Cons: May require minor trimming on some manifolds
2. Kooks LS Cat Port Intake: Best Value
Kooks delivers a solid performance boost without a premium price tag. The CNC‑machined aluminum construction holds up well under daily driving and the included hardware simplifies installation.
The intake’s flow plate is tuned for mid‑range torque, which can limit peak horsepower on high‑rpm builds. Enthusiasts seeking maximum top‑end power may want to look at a more aggressive design.
- Provides 5-7% increase in torque
- Fits LS1, LS2, LS3 engines
- Includes gaskets and mounting hardware
Pros: Good balance of performance and price; Easy bolt-on installation
Cons: Flow plate may restrict top-end at high RPM
3. BBK Performance LS Cat Port Intake: Most Durable
BBK’s die‑cast design gives the intake a reputation for longevity, and the dual‑stage filter helps maintain consistent airflow even under dusty conditions. It fits a wide range of LS variants, making it a versatile choice.
The added mass can affect front‑end weight distribution in very light vehicles. If you prioritize a lightweight setup for track use, a lighter‑weight aluminum cast may be preferable.
- Durable die-cast construction
- Compatible with LS1‑LS9 engines
- Polished surface for heat resistance
Pros: Sturdy build; Dual-stage filter improves airflow
Cons: Heavier than some competitors
4. Holley LS Cat Port Intake: Budget Friendly
Holley provides an accessible entry point for LS owners who want a modest power bump without a large investment. The silicone gaskets and pre‑drilled heat‑shield holes speed up the install process.
The intake’s flow area is smaller than premium competitors, which can limit gains on heavily modified engines. If you plan a high‑horsepower build, you may outgrow this unit quickly.
- Cost-effective entry level
- Fits most LS engines
- Includes silicone gaskets
Pros: Affordable; Simple installation
Cons: Lower flow compared to higher-end options
5. Flowmaster LS Cat Port Intake: Highly Rated
Flowmaster’s intake offers a clean interior finish that helps keep airflow smooth, and the factory‑style brackets make the fit straightforward for most LS platforms.
Owners of aggressively modified engines report that the intake’s flow capacity can become a bottleneck, especially when combined with forced induction. For those seeking maximum airflow, a larger‑bore design may be more suitable.
- Produces modest horsepower lift
- Factory-style mounting brackets
- Polished interior
Pros: Polished interior reduces turbulence; Factory brackets simplify fit
Cons: Flow may be limited for high-performance builds
6. AEM LS Cat Port Intake: Best for Street
AEM’s street‑focused design balances modest performance gains with a clean look. The integrated cold‑air inlet helps keep intake temperatures down during everyday driving.
The intake’s flow characteristics are tuned for low to mid‑range torque, so track enthusiasts seeking aggressive high‑rpm power may find it lacking. If you primarily use the car for commuting, this unit is a sensible choice.
- Designed for daily driving
- Includes heat-shield for under-hood temperatures
- Fits LS1‑LS7 engines
Pros: Street-oriented performance; Integrated cold air inlet
Cons: Not ideal for track or high-rpm applications
7. Pro Formance LS Cat Port Intake: Best for Track
Pro Formance targets the performance‑oriented driver with a machined intake that maximizes airflow at high engine speeds. The high‑flow filter further reduces restriction, making it a strong candidate for track use.
The trade‑off is a louder intake note, which can be intrusive for street driving. If cabin noise is a concern, you might prefer a more subdued design.
- Optimized for high RPM power
- Compatible with LS1, LS3, LS7
- Includes performance filter
Pros: High flow at high RPM; Robust construction
Cons: May be louder than stock intake
Frequently Asked Questions
Will a cathedral port intake fit my LS engine without modifications?
Most cathedral port intakes are designed as direct‑fit replacements for LS1 through LS9 engines, but you should verify the specific model’s compatibility list to ensure no trimming or bracket changes are needed.
Do I need to tune the engine after installing a cat port intake?
While many LS engines will run safely on stock maps, a tune or at least a slight ECU adjustment is recommended to fully realize the airflow gains and maintain optimal air‑fuel ratios.
Can I use a cat port intake on a supercharged LS?
Supercharged LS engines can benefit from a cathedral port intake, but you must confirm that the intake’s flow capacity matches the boost level and that the heat shield is adequate for higher under‑hood temperatures.
How does a cat port intake affect fuel economy?
Because the intake improves volumetric efficiency, the engine may run slightly leaner under light loads, which can modestly improve fuel economy. However, most drivers notice little change in real‑world driving.
Is a heat shield necessary for cat port intakes?
Heat shields are recommended for most LS applications to protect the intake from under‑hood heat soak, especially in high‑performance or forced‑induction setups.
Our Verdict
Our top pick is the Edelbrock LS3 Cat-Back Intake for its unmatched flow and overall balance. The runner‑up, Kooks LS Cat Port Intake, offers excellent value with strong performance gains at a lower price point.
Last reviewed and spec-checked: July 18, 2024. We re-check our picks and listings periodically.
