The LS3 engine is a beast, but even beasts can benefit from a little help. One of the best ways to unleash some extra horsepower from your LS3 is by upgrading the intake manifold. A better manifold can significantly improve airflow, leading to noticeable gains in both horsepower and torque. Swapping out the stock manifold is a pretty common upgrade for anyone looking to get more out of their engine. So, which intake manifolds are actually worth your money?
Here are five of the best LS3 intake manifolds, each with its own strengths and weaknesses.
Product Overview / Quick Summary
- FAST 102mm LSXR Intake Manifold: Maximum airflow for high-horsepower builds.
- Holley EFI Hi-Ram Intake Manifold Kit: Aggressive look with modular design for racing applications.
- Edelbrock Performer RPM Intake Manifold: Excellent balance of performance and streetability.
- MSD Atomic LS Intake Manifold: Polymer construction for weight savings and improved thermal resistance.
- GM Performance LS3 Intake Manifold: Direct OEM replacement, great for maintaining factory reliability.
Top 5 Best Intake Manifold For LS3
1. FAST 102mm LSXR Intake Manifold
The FAST 102mm LSXR intake manifold is designed for high-performance LS3 engines. It’s built to maximize airflow, allowing for significant horsepower gains, especially in heavily modified engines. If you’re chasing big numbers, this is a solid choice.
Pros:
- ✅ Outstanding airflow for maximum horsepower.
- ✅ Durable composite construction.
- ✅ Compatible with aftermarket fuel rails.
Cons:
- ❌ Requires a 102mm throttle body.
- ❌ Can be overkill for stock or mildly modified engines.
- ❌ Higher price point.
Verdict: Best for serious enthusiasts looking for maximum horsepower gains on heavily modified LS3 engines. If you’re building a dedicated track car, this is a strong contender.
2. Holley EFI Hi-Ram Intake Manifold Kit
The Holley EFI Hi-Ram Intake Manifold Kit is all about aggressive styling and performance. It’s ideal for racing applications, offering a modular design that allows for easy customization and upgrades. Plus, it just looks mean under the hood.
Pros:
- ✅ Modular design for easy customization.
- ✅ High-flow runners for improved performance.
- ✅ Eye-catching, aggressive appearance.
Cons:
- ❌ Requires significant hood clearance.
- ❌ Not ideal for street use due to high RPM power band.
- ❌ Can be complex to install and tune.
Verdict: Best for racing applications where hood clearance isn’t an issue and maximum high-RPM power is the goal. If you’re building a show car that also performs, this is a good option.
3. Edelbrock Performer RPM Intake Manifold
The Edelbrock Performer RPM Intake Manifold is a classic choice, known for its excellent balance of performance and streetability. It delivers a noticeable boost in power across a wide RPM range, making it a great all-around upgrade for your LS3. I had one of these on my old small-block Chevy, and it was a night-and-day difference.
Pros:
- ✅ Broad RPM power band for improved street performance.
- ✅ Direct bolt-on installation.
- ✅ High-quality Edelbrock construction.
Cons:
- ❌ Not the highest flowing option available.
- ❌ Traditional design might not appeal to everyone.
- ❌ Performance gains are moderate compared to more aggressive manifolds.
Verdict: Best for those looking for a reliable and noticeable performance upgrade without sacrificing streetability. If you want a simple, effective improvement, this is a solid pick.
4. MSD Atomic LS Intake Manifold
The MSD Atomic LS Intake Manifold stands out due to its polymer construction. This design reduces weight and improves thermal resistance, helping to keep intake air temperatures down. Lower temps mean more power, and less weight always helps.
Pros:
- ✅ Lightweight polymer construction.
- ✅ Improved thermal resistance for cooler intake air.
- ✅ Integrated O-ring seals for easy installation.
Cons:
- ❌ Polymer construction may not be as durable as aluminum.
- ❌ Some users report fitment issues.
- ❌ Not as widely tested as other options.
Verdict: Best for those looking to reduce weight and improve thermal efficiency. If you’re concerned about weight savings, this is a good option to consider.
5. GM Performance LS3 Intake Manifold
The GM Performance LS3 Intake Manifold is a direct OEM replacement, making it an excellent choice for those wanting to maintain factory reliability and fitment. It’s a no-fuss option that provides a slight performance bump over older stock manifolds.
Pros:
- ✅ Direct OEM replacement for easy installation.
- ✅ Maintains factory reliability and fitment.
- ✅ Improved airflow over older stock manifolds.
Cons:
- ❌ Performance gains are minimal compared to aftermarket options.
- ❌ Not ideal for high-performance builds.
- ❌ Can be more expensive than some aftermarket options.
Verdict: Best for those who prioritize factory fitment and reliability over maximum performance gains. If you just want a small upgrade without any headaches, this is the way to go.
Buying Guide
Choosing the right intake manifold for your LS3 engine depends on your specific goals and how you plan to use your vehicle. Here are some factors to consider:
- Performance Goals: Are you looking for maximum horsepower for racing, or a more balanced improvement for street use?
- Engine Modifications: What other modifications have you made to your engine? A high-flow intake manifold might not be beneficial if your other components are restrictive.
- Budget: Intake manifolds range in price from a few hundred dollars to over a thousand. Set a budget and stick to it.
- Installation: Are you comfortable with complex installations, or do you prefer a simple bolt-on replacement?
- Hood Clearance: Some intake manifolds, like the Holley Hi-Ram, require significant hood clearance. Make sure you have enough room.
- Intended Use: Is your car primarily for street use, track days, or drag racing? Choose an intake manifold that matches your intended use. For example, a high-RPM manifold might not be ideal for daily driving.
Consider also the throttle body size. A larger manifold usually needs a larger throttle body to maximize airflow. Don’t forget to factor in the cost of a new throttle body if needed.
Finally, think about tuning. After installing a new intake manifold, you’ll likely need to have your engine tuned to optimize performance and ensure it’s running safely. A proper tune can make a big difference in how your engine performs.
FAQs
Q: Will a new intake manifold really make a difference?
A: Yes, a properly chosen intake manifold can significantly improve your LS3’s horsepower and torque, especially when combined with other performance modifications.
Q: Do I need to get a tune after installing a new intake manifold?
A: It’s highly recommended. A tune will optimize the engine’s performance with the new manifold and ensure it’s running safely.
Q: What size throttle body do I need for a 102mm intake manifold?
A: You’ll need a 102mm throttle body to match the intake manifold and maximize airflow.
Q: Can I install an intake manifold myself?
A: If you have experience working on engines, you can likely install it yourself. However, it’s important to follow the manufacturer’s instructions carefully. If you’re not comfortable, it’s best to have a professional install it.
Q: How much horsepower can I expect to gain?
A: Horsepower gains vary depending on the specific intake manifold and other modifications, but you can typically expect to see gains of 20-50 horsepower.
Conclusion
Upgrading your LS3’s intake manifold is a great way to unlock more power and improve overall performance. Whether you’re looking for maximum horsepower, improved streetability, or a simple OEM replacement, there’s an intake manifold out there that’s perfect for your needs. Consider your budget, performance goals, and intended use to make the best choice for your LS3 engine. Good luck with your upgrade!
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