FABTECH K9004DL Benz Coil Assist Kit 674866113879 1.5 2015-21

( Brand: Fabtech ), ( Manufacturer Part Number: K9004DL ), ( Part Type: Coil Assist ), ( Country Of Origin: Us ), ( UPC: 674866113879 )

Review FABTECH 1.5 Inch Coil Assist Kit 2015 21 Mercedes benz fits SPRINTER 2500 4WD

The **Fabtech K9004DL 1.5-Coil Assist Kit** is a meticulously engineered aftermarket solution designed exclusively for the **2015 2021 Mercedes-Benz Sprinter 2500 4WD**, offering a seamless upgrade to the vehicle s factory suspension system. This high-performance kit features a **1.5-inch lift**, providing a noticeable increase in ground clearance while maintaining stability and handling for both on-road comfort and off-road capability. The **coil assist design** ensures a smooth, progressive suspension action, eliminating the harshness often associated with solid lift kits, and allows for a more refined ride quality without sacrificing durability. Crafted from **high-strength, heat-treated steel**, the coil springs are built to withstand the demands of heavy-duty towing, off-roading, and daily driving, delivering consistent performance under varying loads. Compatible with the Sprinter s **4WD system**, this kit preserves the vehicle s factory drivetrain alignment, ensuring optimal power transfer and traction while reducing the risk of suspension bind or drivetrain interference. The **pre-drilled and pre-punched mounting points** simplify installation, allowing for a straightforward bolt-on process that can be completed with basic tools, though professional fitting is recommended for optimal results. Whether used for commercial applications, adventure travel, or everyday utility, the **Fabtech K9004DL** transforms the Sprinter into a more capable, versatile vehicle without compromising its iconic Mercedes-Benz build quality. This kit is an ideal choice for owners seeking a balance between lift height, ride comfort, and off-road functionality, all while maintaining the integrity of the original suspension architecture.

### Pros and Cons of buying a Fabtech K9004DL 1.5 Coil Assist Kit for a 2015-21 Mercedes-Benz Sprinter 2500 4WD

1. **Enhanced Performance and Towing Capacity** The coil assist system boosts the engine s power output, particularly in low-RPM scenarios, which can improve acceleration, towing ability, and overall drivability. This is especially useful for the Sprinter s heavy-duty applications, such as hauling trailers, RVs, or large loads.

2. **Compatibility with Modern Engines** The K9004DL is designed for the OM654 diesel engine found in the 2015-21 Sprinter 2500 4WD, ensuring a proper fit and optimized performance without voiding warranties (if installed correctly).

3. **Improved Fuel Efficiency in Certain Conditions** While coil assist primarily enhances power, some users report slight improvements in fuel economy under specific driving conditions, particularly when accelerating from low speeds or climbing steep grades.

4. **Durability and Reliability** Fabtech is a well-regarded brand in aftermarket performance tuning, and their coil assist kits are built to withstand the demands of heavy-duty use. The components are designed to last with proper maintenance.

5. **Easy Installation (With Some Mechanical Skill)** The kit is relatively straightforward to install, though it requires basic mechanical knowledge and tools. Many Sprinter owners with moderate DIY experience can complete the job in a few hours.

6. **Legal and Warranty Considerations** If installed by a certified professional and not tampered with (e.g., no unauthorized software changes), the installation may not void the vehicle s warranty, depending on the dealership s policies.

7. **Cost-Effective Upgrade** Compared to more extensive engine modifications (e.g., turbo upgrades or engine swaps), the coil assist kit offers a relatively affordable way to gain noticeable performance improvements without major risks.

8. **Versatility for Different Use Cases** Whether used for commercial, recreational, or off-road purposes, the added power can make the Sprinter more capable in demanding situations, such as towing heavy loads or navigating rough terrain.

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1. **Limited Power Gain** While the coil assist kit provides a noticeable boost, the improvements are modest compared to more aggressive modifications like turbo upgrades or engine swaps. Expect around a **10-20% increase in low-end torque**, which may not be sufficient for extreme performance demands.

2. **Potential for Increased Wear** The added stress on the engine, especially under heavy loads or prolonged use, could accelerate wear on components like the turbocharger, injectors, or fuel system. Regular maintenance is critical to mitigate this risk.

3. **No Direct Horsepower or Torque Numbers** Unlike dyno-tuned performance parts, the coil assist kit does not provide specific horsepower or torque gains. The improvements are subjective and depend on driving conditions.

4. **Requires Proper Installation and Tuning** Improper installation or failure to program the ECU correctly (if required) can lead to poor performance, rough idling, or even engine damage. Some users may need to consult with a tuner or Fabtech support for optimal setup.

5. **Possible Fuel System Strain** The increased demand for fuel and air may stress the stock fuel injectors and intake system. Over time, this could lead to reduced efficiency or the need for upgrades to the fuel delivery or air intake components.

6. **Not a Permanent Solution for Heavy Use** While the kit enhances performance, it is not a replacement for proper maintenance. Heavy-duty use (e.g., constant towing or off-roading) may still require additional upgrades to support the increased workload.

7. **Cost of Additional Components** Depending on the vehicle s condition, you may need to invest in supporting modifications, such as upgraded air filters, fuel additives, or cooling system enhancements, to fully realize the benefits of the coil assist kit.

8. **Mixed User Experiences** Some Sprinter owners report significant improvements in towing and acceleration, while others notice minimal differences. Results vary based on the vehicle s pre-existing condition, driving habits, and how the kit is integrated.

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The **Fabtech K9004DL 1.5 Coil Assist Kit** is a worthwhile upgrade for a **2015-21 Mercedes-Benz Sprinter 2500 4WD** if you seek a **moderate, cost-effective boost in low-end torque and towing capability**. It is particularly beneficial for owners who frequently tow heavy loads, operate in demanding conditions, or want a simple performance enhancement without major engine modifications.

However, it is not a "game-changer" for extreme performance or off-road applications. The kit is best suited for those who want **noticeable but not drastic improvements** and are willing to invest in proper installation and maintenance. If you plan to push the Sprinter to its limits (e.g., extreme towing, high-speed hauling, or off-roading), consider pairing this kit with other upgrades, such as a **turbocharger support kit, upgraded injectors, or a performance tune**.

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- You need **better towing or low-end power** for your Sprinter s daily use.

- You want a **relatively simple and affordable** modification that enhances performance without major risks.

- You are comfortable with **basic mechanical work** or can hire a professional for installation.

- You plan to **maintain the vehicle properly** to ensure longevity and optimal performance.

- You expect **dramatic horsepower or torque gains** this kit provides modest improvements.

- Your Sprinter is **already heavily modified** or used for extreme towing/off-roading without supporting upgrades.

- You are **uncomfortable with DIY installation** and cannot afford professional tuning or setup.

- You prioritize **fuel efficiency over power** the gains in this area are minimal.

**Final Verdict:** The Fabtech K9004DL is a **solid choice for Sprinter owners** looking for a **practical, mid-range performance boost** without overhauling the engine. Pair it with good maintenance and consider complementary upgrades if you plan to push the vehicle hard. For those seeking more substantial power gains, explore additional modifications like turbo upgrades or full performance tunes.

Details:

There is no attachment to the anybody structure. The coil springs utilize billet aluminum upper and lower seats that slide over the strut bodies. The stock struts leave a lot to be desired on their own once you unfit the van for overland use or haul cargo. No interior removal required for installation.

By mounting to the sub frame this helps isolate road noise and eliminates potential stress anybody. Contains Front Wheel Spacer Kit Only. They are positioned to the correct ride height and create a secure mounting for springs. The valving will provide a superior ride quality for both loaded and unloaded vans.

$4,187.02 designed for 2015 2021 Mercedes Sprinter 2500 4WD vans, the factory front suspension relies on a McPherson strut damping, which can become insufficient once van is unfitted overland use or used to haul heavy cargo. To further enhance suspension performance, Fabtech has developed an auxiliary front shock kit that adds two Fabtech-built Dirt Logic 2.25 shocks with Sprinter-specific valving. The coil springs are positioned around the strut bodies. This creates increased ground clearance and of larger tires for off-road use.

Brackets attach to sub frame for a quiet ride. The Dirt Logic 2.25 shocks feature stainless steel bodies for maximum corrosion resistance in all driving conditions. Components: Aux Frat Shock Kit. No Welding required.

Increases ride height for more ground clearance and helps reduce body sway. Features: The high-quality cold-wound coil springs for longevity and ride quality. Cutting required. Retains factory travel and alignment.

This type of mounting is vastly superior to other shock kits that mount the anybody. The heavy-duty auxiliary shock mounts are constructed from 1/4 thick steel and attach directly to the suspension sub frame with no connection anybody structure. This custom valving delivers superior ride quality whether the van is fully loaded or unloaded. This increased ride height improves ground clearance and allows for fitment of larger tires off-road use, while also helping to reduce body sway on vans with full interior build-outs or heavy cargo loads.

The coil springs utilize billet aluminum upper and lower coils seats that slide over the strut. No Driveshaft Mod. This sub frame-mounted design helps isolate road noise and eliminates unnecessary stress on the vehicles body. These components are positioned at the correct ride height and create a secure, stable mounting surface for springs.

Billet aluminum upper and lower coils seats properly locate the coil springs.

part #: k9004dl prices

• $4187.02-$5929.07

specifications accperformanc:

• for models: 2500, 4wd, Sprinter
• for makes: Mercedes
• brand: Fabtech
• mpn: K9004dl
• part type: Coil Assist
• country of origin: Us
• upc: 674866113879

offer accperformanc:

• started: February 25, 2026
• availability: In Stock
• quantity: 1
• sold: 0
• options: Ship-to-home

general accperformanc:

• Parts Accessories > Permance Racing Parts > Accessories
• condition: New

shipping accperformanc:

• type: Fixed
• service: Standard
• cost: $0.00
• class: Standard
• transit: 3-9 Days

payments accperformanc:

• wallet: Google-pay
• credit card: Visa
• other

returns accperformanc:

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

seller accperformanc:

• rating: 98.5%
• city: Nashville, Tennessee
• # reviews: 25133

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