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5.7L vs 6.4L Downpipes: What’s the Difference & Which One’s Right for Your Build?
Upgrading your exhaust setup is one of the easiest ways to unlock real power, better sound, and smoother flow from your HEMI engine. But if you’re comparing 5.7L and 6.4L engines, there’s more than just size on the table. Let’s break down the key differences between the two most popular downpipes from Khaos Motorsports, and help you pick the perfect fit for your ride.
🛠️ The Power of a Proper Downpipe
Whether you're building your daily driver or prepping your weekend track beast, your downpipe has a huge impact on airflow, back pressure, and tone. That’s why Khaos Motorsports engineered two precision-built options tailored specifically for HEMI drivers, one for the 5.7L, and one for the 6.4L.
⚙️ Product Breakdown
🔵 5.7L High-Flow Catted Down Pipe (AWD Interceptor)
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Material: Aluminized steel
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Design: Mandrel-bent for max airflow
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Fitment: Direct bolt-on for AWD Interceptor models
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No Tune Needed: Designed to keep the CEL off
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Price: $599.99
🛒 Shop the 5.7L Down Pipe →
🔴 6.4L High-Flow Catted Down Pipe (304 Stainless Steel)
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Material: 304-grade stainless steel
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Design: TIG-welded, Magnaflow high-flow cats
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Fitment: Built for 6.4L Dodge Challenger, Charger, and 300
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No Tune Needed: Most setups stay CEL-free
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Price: $1,199.99
🛒 Shop the 6.4L Down Pipe →
| Feature | 5.7L Downpipe | 6.4L Downpipe |
|---|---|---|
| Material | Aluminized steel | 304 stainless steel |
| Performance Focus | Mid-range gains, daily driver friendly | High output builds, long-term durability |
| Sound | Thicker tone, deeper growl | Aggressive, louder exhaust note |
| Installation | Bolt-on, no tune needed | Bolt-on, no tune needed |
| Price | $599.99 | $1,199.99 |
🧰 Which One’s Best for You?
💡 Go 5.7L if:
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You’re looking for performance on a budget
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You have a 5.7L AWD Interceptor or similar model
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You want an easy install with minimal mods
🔥 Go 6.4L if:
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You want maximum flow and louder tone
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You’re building a track-focused or high-output HEMI
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You want 304 stainless steel that resists rust and heat
👇 Final Take
Both downpipes offer serious upgrades, but they’re built for different beasts. If you’ve got a 5.7L and want better performance without breaking the bank, the aluminized 5.7L version is your move. But if you’re rolling with a 6.4L and want the best of the best, the stainless TIG-welded version is worth every penny.
🏁 Ready to Upgrade Your HEMI?
Whether you're chasing horsepower or just want to wake up your exhaust note, Khaos Motorsports has the downpipe that’ll help you dominate your build.
🛒 Shop the 5.7L Down Pipe
🛒 Shop the 6.4L Down Pipe
🤔 Frequently Asked Questions
### What’s the difference between a 5.7L and 6.4L downpipe?
The main differences are material quality, price, and performance tuning. The 5.7L downpipe is made from aluminized steel and offers great value for daily drivers, while the 6.4L downpipe uses TIG-welded 304 stainless steel and is built for high-performance builds.
### Will these downpipes trigger a check engine light?
No, both the 5.7L and 6.4L downpipes are designed to work with your OEM sensors and typically do not trigger a CEL. However, results can vary by setup.
### Do I need a tune after installing a downpipe?
No tune is required for either the 5.7L or 6.4L downpipes from Khaos Motorsports. They’re engineered for bolt-on ease with no additional tuning needed in most cases.
### Is the 6.4L downpipe worth the higher cost?
If you're running a high-output HEMI or want long-lasting stainless construction and more aggressive exhaust tone, the 6.4L is worth the investment.
### Can I install the downpipe myself?
Yes! Both downpipes are designed as direct bolt-on installs. With basic tools and some mechanical knowledge, this is a great DIY upgrade.
