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  2. sku: 15160079690118603
  3. FEL PRO SX-3548

FEL-PRO SX-3548 Fuel Injector Ring Air Kit RS4 4.2L V8

fits make: Audi. year: 2007–2008.

Sx-3548 Fel-pro Fuel Injector O-ring Kit For 2007-2008 Audi Rs4 4.2l V8 Air Delivery Bl

( Brand: Fel-pro ), ( Manufacturer Part Number: SX-3548 ), ( Type: Fuel Injector O-ring Kit ), ( Item Weight: 0.0500 ), ( Manufacturer Warranty: 1 Year ), ( Item Height: 0.160 ), ( Item Length: 6.000 ), ( Item Width: 4.000 ), ( Ipn: C828 57-31 ), ( Placement On Vehicle: Air Fuel Delivery Service Kits ), ( Compatible Model: Rs4 ), ( Compatible Year: 2008 2007 ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement ), ( Bundle Description: 1 Pc Genuine Fel-pro Fuel Injector O-ring Kit )

Review FEL PRO Fuel Injector O ring Kit Audi Rs4 4.2l V8 Air Delivery Bl fits 2007–2008

The **Fel-Pro SX-3548 Fuel Injector O-Ring Kit** is a precision-engineered aftermarket solution specifically designed to ensure a perfect seal and reliable performance for the high-performance **2007 2008 Audi RS4 4.2L V8 Air** fuel injection system. This kit is meticulously crafted to meet the demanding requirements of Audi s advanced direct-injection technology, where even the slightest failure in sealing can lead to fuel leaks, reduced efficiency, or potential engine damage. Engineered from high-quality **Nitrile rubber (Buna-N)**, the o-rings in this kit are formulated to withstand the extreme pressures and temperatures generated by the RS4 s high-output fuel injectors, ensuring long-lasting durability and consistent performance under heavy loads. The kit includes all necessary **fuel injector o-rings, gaskets, and seals** required for a complete and hassle-free replacement, eliminating the need for mixed or incomplete parts from other sources. Fel-Pro s **SX series** components are known for their superior fitment, enhanced resistance to fuel degradation, and improved resistance to swelling from ethanol-blended fuels a critical consideration for modern high-performance vehicles. Whether you're performing a routine maintenance service, addressing a fuel leak, or upgrading your RS4 s fuel system, this kit provides the confidence of a professional-grade solution that aligns with OEM specifications while offering an upgrade in reliability. Perfect for mechanics and enthusiasts alike, the **Fel-Pro SX-3548** ensures a clean, leak-free installation that helps maintain optimal fuel delivery and engine performance for your 4.2L V8 Audi RS4.

### **Pros and Cons of buying a Fel-Pro SX-3548 Fuel Injector O-Ring Kit for a 2007 2008 Audi RS4 4.2L V8 (Air Injection System)**

#### **Pros:**

1. **High-Quality Materials** Fel-Pro is a well-respected brand known for durable, high-performance gaskets and seals. Their O-rings are designed to resist heat, fuel, and pressure, which is critical for fuel injectors operating under demanding conditions.

2. **Direct Fitment** The SX-3548 kit is specifically engineered for the 2007 2008 Audi RS4 4.2L V8 with the air injection system. This ensures proper sizing and compatibility, reducing the risk of leaks or improper installation.

3. **Prevents Fuel Leaks** Fuel injector O-rings degrade over time due to heat, fuel additives, and vibration. Replacing them proactively prevents fuel leaks, which can contaminate the engine bay, damage wiring, or even cause electrical shorts.

4. **Improves Injector Reliability** Worn O-rings can lead to inconsistent fuel delivery, reduced performance, or even injector failure. Fresh O-rings help maintain precise fuel metering, supporting engine efficiency and longevity.

5. **Easy Installation** Fel-Pro kits typically include clear instructions, and the O-rings are designed for straightforward replacement. This makes the job manageable for experienced DIYers or mechanics.

6. **Cost-Effective Solution** Replacing O-rings is far cheaper than dealing with the consequences of a failed injector or fuel system contamination. It s a preventive maintenance measure that avoids more extensive repairs.

7. **Compatibility with Aftermarket Injectors** If you ve upgraded to aftermarket injectors (e.g., for tuning), these O-rings will ensure a proper seal, preventing leaks that could interfere with performance gains.

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#### **Cons:**

1. **Limited Availability** Fel-Pro parts may not be as widely stocked as generic or budget brands, requiring special ordering from auto parts suppliers or online retailers. This could add time to the purchase process.

2. **Potential Overkill for Minor Issues** If the O-rings are still in decent condition but slightly worn, replacing them may not be immediately necessary unless you re performing a full fuel system service or tuning project.

3. **Installation Requires Care** Improper handling of O-rings (e.g., stretching, cross-threading, or improper lubrication) can lead to leaks or damage. This requires attention to detail, especially when working with fuel injectors.

4. **Cost Relative to Other Brands** While Fel-Pro is high-quality, it may be more expensive than generic O-ring kits. For some, the price difference may not justify the purchase unless they prioritize long-term reliability.

5. **May Need Additional Supplies** Depending on the extent of the job, you might also need fuel injector cleaner, a torque wrench, or specialized tools (e.g., injector removal tool), adding to the overall cost.

6. **Not a Permanent Fix for Underlying Issues** If the fuel injectors themselves are failing (e.g., clogged, internally damaged), replacing O-rings won t resolve the root problem. A full injector service or replacement may still be needed later.

---

### **Conclusion:**

The **Fel-Pro SX-3548 O-ring kit is a strong choice** for the 2007 2008 Audi RS4 4.2L V8, particularly if you re performing maintenance, tuning, or suspecting O-ring wear. Its high-quality materials and direct fitment make it a reliable upgrade over generic alternatives. However, it s not strictly necessary unless you re experiencing leaks, poor performance, or planning a fuel system overhaul.

If your injectors are functioning well and the O-rings appear intact, the kit may not be an urgent priority. But if you re proactive about engine care or preparing for a build, the investment is justified for long-term reliability.

### **Recommendation:** - **Buy the Fel-Pro kit if:**

- You re replacing injectors or performing a fuel system service.

- You ve noticed fuel leaks, rough idle, or reduced performance.

- You want premium-quality parts for a tuning project.

- You re comfortable with DIY maintenance and have the tools to install them properly.

- **Skip or delay if:**

- The O-rings look fine and you re not experiencing issues.

- You re on a tight budget and can monitor the injectors for wear.

- You re not planning any modifications that would benefit from fresh O-rings.

For most RS4 owners, **this kit is a smart preventive measure**, especially given the engine s high-performance nature. Pair it with a fuel system cleaner (e.g., CRC or Techron) during installation for optimal results. If in doubt, consult a trusted mechanic to assess whether the O-rings need replacement.

Details:

Fel-Pro Fuel Injector O-Ring Kit for 2007 - 2008 Audi RS4 4.2L V8 Air Delivery bl: Status: In Stock.

part #: sx3548 prices

  • $29.83-$144.92

specifications carfuelinjector:

  • for makes: Audi
  • for years: 2007-2008
  • brand: Fel-pro
  • mpn: Sx-3548
  • type: Fuel Injector O-ring Kit
  • item weight: 0.0500
  • manufacturer warranty: 1 Year
  • item height: 0.160
  • item length: 6.000
  • item width: 4.000
  • ipn: C828 57-31
  • placement on vehicle: Air Fuel Delivery Service Kits
  • compatible model: Rs4
  • compatible year: 2008 2007
  • core charge: Free No Core Charge
  • fitment type: Direct Replacement
  • bundle description: 1 Pc Genuine Fel-pro Fuel Injector O-ring Kit

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  • credit card: Discover
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offer carfuelinjector:

  • started: March 8, 2026
  • options: Ship-to-home
  • quantity: 10
  • availability: In Stock
  • sold: 0

seller carfuelinjector:

  • # reviews: 630268
  • city: Indianapolis, Indiana
  • rating: 99.5%

shipping carfuelinjector:

  • class: Standard, Expedited
  • service: Standard, Expedited
  • transit: 3-6 Days
  • type: Fixed
  • cost: $0.00

returns carfuelinjector:

  • time: 30 Days
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general carfuelinjector:

  • Air Fuel Delivery > Fuel Injection Parts > Fuel Injectors
  • condition: New
for makes: audi, for years: 2007-2008, type: fuel injector o-ring kit, item weight: 0.0500, manufacturer warranty: 1 year, item height: 0.160, item length: 6.000, item width: 4.000, placement on vehicle: air fuel delivery service kits, compatible model: rs4, compatible year: 2008 2007, core charge: free no core charge, fitment type: direct replacement, bundle description: 1 pc genuine fel-pro fuel injector o-ring kit,
category: auto parts > air fuel delivery > fuel injection parts > fuel injectors, sku: 15160079690118603,
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