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  3. FLOWMASTER 817585

FLOWMASTER 817585 American Crossmember Exhaust 700042027484

fits model: Thunder.

817585 Flowmaster American Thunder Crossmember-back Exhaust System

( Brand: Flowmaster ), ( Type: Crossmember-back ), ( Material: 409 Stainless Steel ), ( Finish: Natural ), ( UPC: 700042027484 ), ( Manufacturer Part Number: 817585 )

Review FLOWMASTER American Crossmember back Exhaust System fits THUNDER

The Flowmaster American Thunder Cross Member-Back Exhaust System, model number 817585, is a high-performance aftermarket exhaust solution designed to enhance the power and sound of your vehicle. This system is engineered specifically for specific makes and models, ensuring a perfect fit and optimal performance.

The American Thunder system is made from premium 409 stainless steel, which is known for its durability and resistance to rust and corrosion. This material not only provides a sleek, polished look but also ensures a long-lasting exhaust system.

The Flowmaster mufflers integrated into this system are designed with a unique and patented "Flowfold" technology. This technology utilizes a series of specially designed, serpentine-shaped, sound-absorbing cylinders, which provide an exceptional balance between performance and noise level. The American Thunder system produces a deep, resonant exhaust note that is both powerful and pleasing to the ear.

One of the key features of this exhaust system is the cross-member-back configuration. This design routes the exhaust pipes along the underside of the vehicle, connecting to the rear cross member. This mounting method provides improved clearance, particularly for vehicles with low ground clearance or large exhaust tips. Additionally, it helps to reduce the weight of the exhaust system by eliminating the need for hanging the pipes from the chassis.

The American Thunder system also includes all necessary hardware and mounting brackets for a straightforward installation process. The system is designed to be bolt-on, making it a popular choice for enthusiasts who want to upgrade their exhaust without the need for extensive fabrication or welding work.

In summary, the Flowmaster 817585 American Thunder Cross Member-Back Exhaust System is a high-quality, high-performance aftermarket exhaust solution that delivers increased power, improved sound, and enhanced durability. With its sleek stainless steel construction, patented Flowfold technology, and cross-member-back design, this system is an excellent choice for those seeking to elevate their vehicle's exhaust system.

Pros and Cons of Buying Flowmaster American Thunder 817585 Crossmember-Back Exhaust System

The Flowmaster American Thunder 817585 Crossmember-Back Exhaust System is a popular aftermarket exhaust option for those seeking improved performance and a more appealing exhaust note. Like any product, it comes with its advantages and disadvantages.

Pros:

1. Enhanced Exhaust Note: The American Thunder exhaust system is known for its distinctive and aggressive exhaust note. It provides a more pleasing sound, especially when compared to the stock exhaust.

2. Increased Performance: The exhaust system can help improve engine performance by reducing back pressure, allowing the engine to breathe more efficiently. This often translates to increased horsepower and torque.

3. Durability: Flowmaster exhausts are generally well-built and can withstand the rigors of regular use. The American Thunder system is no exception, as it features stainless steel components and robust construction.

4. Improved Fuel Economy: Some users report improved fuel economy due to the more efficient exhaust flow. This can result in savings at the gas pump over time.

Cons:

1. Cost: The Flowmaster American Thunder 817585 Crossmember-Back Exhaust System can be more expensive than a stock exhaust or other aftermarket options. The cost may be a deterrent for some potential buyers.

2. Installation: Installing an aftermarket exhaust system can be a complex process, especially for those without prior experience. The American Thunder system may require professional installation, which adds to the overall cost.

3. Noise Levels: The exhaust system produces a louder exhaust note than a stock exhaust. This may be a concern for those who value quietness or live in areas with strict noise regulations.

4. Weight: The American Thunder system is heavier than a stock exhaust due to the larger diameter piping. This can impact fuel economy and handling, but the performance benefits may outweigh the drawbacks for many.

Conclusion:

The Flowmaster American Thunder 817585 Crossmember-Back Exhaust System offers several advantages, including improved performance, enhanced exhaust note, durability, and potential fuel economy savings. However, it also comes with some downsides, such as a higher cost, complex installation process, increased noise levels, and added weight.

Recommendation:

If you're seeking improved performance, a more appealing exhaust note, and are willing to invest in a high-quality aftermarket exhaust system, the Flowmaster American Thunder 817585 Crossmember-Back Exhaust System is an excellent choice. Keep in mind that the higher cost and complex installation process may be a deterrent for some potential buyers. Ultimately, the decision to purchase this exhaust system depends on your individual preferences, budget, and priorities.

part # 817585 price

  • $1229.95

specifications frazzlekits:

  • for models: Thunder
  • brand: Flowmaster
  • type: Crossmember-back
  • material: 409 Stainless Steel
  • finish: Natural
  • upc: 700042027484
  • manufacturer part number: 817585

shipping frazzlekits:

  • service: UPS Ground
  • carrier: UPS
  • type: Fixed
  • cost: $0.00
  • class: Standard
  • transit: 4-6 Days

payments frazzlekits:

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

returns frazzlekits:

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

seller frazzlekits:

  • # reviews: 15070
  • rating: 98.9%

offer frazzlekits:

  • quantity: 10
  • started: June 13, 2025
  • sold: 0
  • options: Ship-to-home
  • availability: In Stock

general frazzlekits:

  • condition: New
  • Car Truck Parts Accessories > Exhaust Emission Systems > Exhaust System Kits
for models: thunder, type: crossmember-back, finish: natural,
category: auto parts > car truck parts accessories > exhaust emission systems > exhaust system kits, material: 409 stainless steel, sku: 5146677569841632,

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