SPEEDWAY MOTORS 91607085 Ls Hotside Header Kit

( Brand: Speedway Motors ), ( Manufacturer Part Number: 91607085 ), ( Part Type: Header Motor ), ( California Prop 65 Warning: False )

Review SPEEDWAY MOTORS Polished Stainless Ls Hotside Header Kit Inch V band fits TWIN TURBO

The **Speedway 91607085 LS Twin Turbo Hot-Side Header Kit with V-Band Flanges** is a meticulously engineered aftermarket exhaust component designed to elevate the performance and aesthetics of high-output LS-based engines, particularly those paired with twin-turbo setups. Crafted from high-quality **409 stainless steel**, this header kit is built to withstand the extreme heat and pressure generated by aggressive turbocharging applications while maintaining structural integrity over prolonged use. The **hot-side configuration** ensures optimal exhaust flow by directing the gases away from the turbochargers, reducing backpressure and improving scavenging efficiency critical for maximizing horsepower and torque in forced-induction applications. The **V-band flanges** provide a secure, leak-free connection to the turbo outlets, allowing for easy installation and removal without the need for welding, making this kit a versatile choice for both stock and heavily modified LS engines. Whether paired with a supercharger, twin turbos, or a high-flow cat-back system, this header kit enhances exhaust velocity, reduces turbo lag, and delivers a deep, aggressive exhaust note that resonates with both performance enthusiasts and purists. Built to complement a wide range of LS engine variants including the **LS1, LS2, LS3, LS7, and LS9** this kit is an essential upgrade for those seeking a balance of performance gains and premium durability.

The **Speedway 91607085 LS Twin Turbo Hot-Side Header Kit with V-Band Flanges** is a popular aftermarket exhaust component designed for GM LS-based engines, particularly those with twin-turbo setups. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Improved Exhaust Flow and Backpressure Reduction**

The kit is designed to optimize exhaust gas flow by reducing restrictive backpressure, which can enhance turbocharger efficiency and scavenging. This is particularly beneficial for forced-induction applications where proper exhaust tuning is critical.

2. **High-Quality Materials and Construction**

Speedway headers are known for their durable stainless steel construction, which resists corrosion and heat damage better than mild steel or galvanized alternatives. The V-band flanges provide a secure, leak-free connection to the turbo outlets and downpipe.

3. **Compatibility with Twin-Turbo Setups**

The kit is specifically engineered for LS twin-turbo applications, ensuring proper spacing and alignment for both turbos. This reduces the risk of interference or improper exhaust gas routing, which can lead to performance losses or damage.

4. **Easier Installation Compared to Welded Headers**

Unlike custom-welded headers, this V-band kit can be installed without welding, making it a more accessible option for DIY enthusiasts. The modular design allows for adjustments and potential future modifications.

5. **Sound Enhancement**

The kit contributes to a deeper, more aggressive exhaust tone compared to stock or aftermarket downpipes alone. While not as extreme as a full cat-back system, it adds a noticeable growl, especially under throttle.

6. **Support for High-Performance Applications**

For engines running high boost or large turbos, reducing exhaust restriction can help maintain turbo spool and prevent lag. The kit s design minimizes pulse interference, which is critical for twin-turbo setups.

7. **Aftermarket Support and Tuning**

The improved exhaust flow can be paired with tuning (e.g., ECU adjustments) to further optimize power delivery, fuel efficiency, or throttle response.

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### **Cons**

1. **Cost Relative to Stock or Basic Downpipes**

The Speedway kit is more expensive than OEM exhaust components or basic aftermarket downpipes. For stock or mildly modified engines, the performance gains may not justify the investment.

2. **Limited Customization**

Unlike custom-welded headers, this kit offers little flexibility in terms of material choice (e.g., no titanium or exotic alloys) or unique designs. It s a standardized part rather than a bespoke solution.

3. **Potential for Leaks at V-Band Flanges**

While V-band flanges are generally reliable, they require proper installation and periodic checking for wear or loosening. Improper tightening can lead to leaks, and the clamps may need replacement over time.

4. **Not a Full Cat-Back System**

This is a header kit only, meaning it connects to the turbo outlets and typically mates with an existing downpipe or cat-back system. If you re looking for a complete exhaust upgrade (including mufflers or resonators), additional components are needed.

5. **Weight Considerations**

Stainless steel headers are heavier than some alternative materials (e.g., titanium). While this isn t a major concern for most applications, it may be a factor in high-performance builds where weight reduction is prioritized.

6. **Installation Complexity for Beginners**

While easier than welding, installing V-band headers requires careful alignment of the turbos and downpipe. Misalignment can cause exhaust gas leaks or improper turbo function. Some enthusiasts may still need professional help.

7. **Limited Aesthetic Appeal**

The kit is functional first and foremost, with a utilitarian design. If appearance is a priority, you may need to pair it with a custom exhaust system or mufflers for a polished look.

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### **Conclusion**

The **Speedway 91607085 LS Twin Turbo Hot-Side Header Kit** is a strong choice for LS-based twin-turbo engines, particularly those running forced induction or high-performance builds. Its primary strengths lie in improved exhaust flow, durability, and compatibility with twin-turbo setups. However, it is not a universal solution it may be overkill for stock or mildly modified engines and requires additional components for a complete exhaust upgrade.

- You re running boost and want to optimize turbo performance.

- You re upgrading from stock or restrictive aftermarket downpipes.

- You prioritize durability and ease of installation over customization.

For enthusiasts who want a more aggressive sound or plan to pair it with a full cat-back system, the headers will complement those upgrades well. Conversely, those on a tight budget or with minimal modifications may find the gains marginal compared to the cost.

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### **Recommendation**

- You have a twin-turbo LS engine running boost (e.g., 10 psi) and want to reduce backpressure for better spool and efficiency.

- You re upgrading from stock or a basic downpipe and want a high-quality, modular solution.

- You value durability and ease of installation over customization.

- You plan to pair it with a tuning solution or additional exhaust components (e.g., mufflers, resonators).

- Your engine is stock or runs minimal boost (e.g.,

- You re on a tight budget and can achieve similar results with a less expensive downpipe or cat-back system.

- You prioritize aesthetics over performance, as the kit alone won t provide a polished look.

- You lack experience with exhaust installations, as improper setup could lead to leaks or turbo issues.

- For a more aggressive sound or aesthetic, pair the headers with a cat-back system like the **Speedway 91607086** or **Borla**.

- If weight is a concern, explore custom-welded headers (e.g., **Titanium or Inconel**) for high-performance builds.

- For stock or low-boost applications, a **performance downpipe** (e.g., **Speedway 91607084**) may suffice at a lower cost.

Ultimately, the Speedway headers are a solid mid-tier upgrade for twin-turbo LS engines, offering a balance of performance, durability, and practicality. Weigh the cost against your specific goals to determine if it s the right fit for your build.

Details:

Polished Stainless, Includes T3/T4 90 V-band elbow adapter, Sold as a Kit.

part #: 91607085 price

• $925.99

specifications emissyste:

• for models: Turbo, Twin
• brand: Speedway Motors
• mpn: 91607085
• part type: Header Motor
• california prop 65 warning: False

returns emissyste:

• paid by: Seller
• policy: Returns Accepted
• time: 30 Days

offer emissyste:

• options: Ship-to-home
• started: May 5, 2026
• sold: 0
• availability: In Stock

general emissyste:

• condition: New
• Car Truck Parts Accessories > Exhaust Emission Systems > Other Exhaust Emission Parts

shipping emissyste:

• transit: 4-4 Days
• cost: $0.00
• class: Standard, Expedited
• service: Standard, Expedited
• type: Fixed

payments emissyste:

• credit card: Diners-club
• other
• wallet: Paypal

seller emissyste:

• rating: 99.8%
• city: Lincoln, NE
• # reviews: 363131

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