1998-2003 Ford F-150 Cat-back Exhaust System Flowmaster American Thunder 817663
1998-2003 Ford F-150 Cat-back Exhaust System Flowmaster American Thunder 817663
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Overview
Flowmaster's American Thunder cat-back exhaust system for the 1998-2003 Ford F-150 pickup truck is perfect for the person looking for an aggressive exterior sound level with all of the performance benefits that you would expect from Flowmaster. This system allows you the choice of either dual out the rear exit tailpipes, or dual out the sides behind the rear wheels, which is perfect for towing. The bolt-on 409S stainless steel system fits both the 4.6L and the 5.4L V8 engines and features a Super 40 Series performance muffler and dual 2.50-inch mandrel-bent tailpipes finished off with a pair of large 3.50-inch polished stainless steel tips. This system is designed to fit all 2/4 wheel drives, all wheelbases and is covered by our Lifetime Limited Warranty. Designed for an easy fit, this system includes all necessary parts and hardware for installation.
Features
- Large 3.50-inch Polished 304 Stainless Steel Tips
- Dual Outlet Super 40 Series Performance Muffler
- Mandrel-bent Stainless Steel Construction
- Aggressive Exterior Performance Tone
- Uses the Factory Hanger Locations
- Multiple Exit Styles Provided in Kit
- Clears the Factory Spare Tire
- Lifetime Limited Warranty
- Moderate Interior Tone
- Easy Installation
Application
- Fits 1998-2003 Ford F-150 with 4.6L or 5.4L engine. Fits both 2/4-wheel drive models.
Specs
2WD/4WD | RWD/4WD |
Brand | Flowmaster |
California Proposition 65 Chemical Name | Chromium (hexavalent compounds) |
California Proposition 65 Chemical Name | Nickel (Metallic) |
California Proposition 65 Required | Yes |
Emission Code | 5 |
Exhaust Series | American Thunder |
Exit Position | Dual Out Rear / Dual Out Side |
Heat Shield | No |
Inlet Diameter (in) | 2.5 |
Material | 409 Stainless Steel |
Muffler Part Number | Kit Only |
Muffler Quantity | 1 |
Muffler Series | Super 40 Series |
Outlet Diameter (in) | 2.5 |
Product Type | Exhaust System |
Single Dual | Dual |
Sound Level | Aggressive |
System Type | Cat-back |
Tip Diameter (in) | 3.5 |
Tip Length (in) | 13 |
Tip Quantity | 2 |
Tubing Diameter (in) | 2.5 |
Warning | California Proposition 65 |




Policies and FAQs
Return Policy
Fault reasons include but are not limited to:
- Buyer was shipped the wrong product
- Buyer was shipped a damaged product
- The product page had incorrect fitment and the part does not fit the Buyer's vehicle
Opened boxes, plastic bags, and other packaging are not considered damage (excluding single use items such as, but not limited to, liquids, software, and other components that cannot be reused/resealed).
FAQs
|Q. What is an Intermediate Brake Line?
|A. This is the line that runs from the front of the vehicle to the rear. On most vehicles it connects to a junction then you will have rear axle lines. On a few cars the intermediate lines will connect to the rear wheels. It is recommended to change the axle lines if you are replacing the intermediate lines.
|Q. What is included in a pre bent brake line kit?
|A. Our kits include all of the solid metal lines for that section of the vehicle
|Q. I need to return something - what's your return policy?
|A. We are happy to help! Please help us to help you by going to our return form and filling out the form as best as you can in order to request a return.
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Modern Day stands by our parts and is happy to accept returns within 30 days of purchase. Parts must be in new condition.
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If a part arrives damaged, or is defective, Please report it to us immediately. So we can handle it for your promptly.