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  • Flowmaster 99-02 Chevrolet/GMC Truck 144in. Wheelbase American Thunder Cat-Back Exhaust System - 17325
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Flowmaster 99-02 Chevrolet/GMC Truck 144in. Wheelbase American Thunder Cat-Back Exhaust System - 17325
Flowmaster 99-02 Chevrolet/GMC Truck 144in. Wheelbase American Thunder Cat-Back Exhaust System - 17325
Flowmaster 99-02 Chevrolet/GMC Truck 144in. Wheelbase American Thunder Cat-Back Exhaust System - 17325
Flowmaster 99-02 Chevrolet/GMC Truck 144in. Wheelbase American Thunder Cat-Back Exhaust System - 17325
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Load image into Gallery viewer, Flowmaster 99-02 Chevrolet/GMC Truck 144in. Wheelbase American Thunder Cat-Back Exhaust System - 17325
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Flowmaster 99-02 Chevrolet/GMC Truck 144in. Wheelbase American Thunder Cat-Back Exhaust System - 17325

Exhaust, Mufflers & Tips Catback
Flowmaster
flo17325
Special order
September 23, 2026
Not CARB compliant. Not legal for sale or use in California on emissions-controlled vehicles.
$524.70 $658.95
For the person who wants a subtle custom appearance with all the benefits that a Flowmaster Cat-back exhaust system provides. This American Thunder system delivers a moderate interior tone with a deep powerful exterior tone and is suited to the enthusiast who wants their performance to be heard. The system attaches to the back of the catalytic converter with a dual inlet 50 Series Big Block muffler for a deep powerful sound without being obnoxious. Includes a large custom formed aluminum heat shield with stainless clamps and easily attaches directly to the muffler body. The custom bent 3.00-inch aluminized steel tailpipe uses the factory hanger locations for an easy installation and exits out behind the right side rear wheel which is ideal for towing. The tailpipe is finished off with a large 3.50-inch polished 304 stainless steel tip embossed with the Flowmaster logo. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include all necessary parts, hardware and easy to follow instructions for a trouble free installation. Notes: Fits 2/4 wheel drive trucks with the extended cab/short bed configuration - 143.5-inch wheelbase. Fits 1999-2002 Chevrolet Silverado and GMC Sierra...
Flowmaster 67-70 Mustang American Thunder Thru Valance Exhaust System - 17281
Flowmaster 67-70 Mustang American Thunder Thru Valance Exhaust System - 17281
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Flowmaster 86-91 Chevrolet Camaro/Pontiac Firebird 3.0in. American Thunder Cat-Back Exhaust System - 17233
Flowmaster 86-91 Chevrolet Camaro/Pontiac Firebird 3.0in. American Thunder Cat-Back Exhaust System - 17233
$877.95 $699.62
Flowmaster 99-02 Chevrolet/GMC Truck 144in. Wheelbase American Thunder Cat-Back Exhaust System - 17325
SKU: flo17325
Product Details

Everything You Need To Know

Review product information, shipping and returns, and price-match details before you order.

Product Info

For the person who wants a subtle custom appearance with all the benefits that a Flowmaster Cat-back exhaust system provides. This American Thunder system delivers a moderate interior tone with a deep powerful exterior tone and is suited to the enthusiast who wants their performance to be heard. The system attaches to the back of the catalytic converter with a dual inlet 50 Series Big Block muffler for a deep powerful sound without being obnoxious. Includes a large custom formed aluminum heat shield with stainless clamps and easily attaches directly to the muffler body. The custom bent 3.00-inch aluminized steel tailpipe uses the factory hanger locations for an easy installation and exits out behind the right side rear wheel which is ideal for towing. The tailpipe is finished off with a large 3.50-inch polished 304 stainless steel tip embossed with the Flowmaster logo. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage. Designed for an easy fit, these systems include all necessary parts, hardware and easy to follow instructions for a trouble free installation. Notes: Fits 2/4 wheel drive trucks with the extended cab/short bed configuration - 143.5-inch wheelbase.

Fits 1999-2002 Chevrolet Silverado and GMC Sierra 2500 3/4 Ton truck (not-HD) with 6.0L engine, fits 2/4 wheel drive with extended cab/short bed configuration on 143.5-inch wheelbase.

Features & Benefits

  • Includes an Aluminum Heat Shield for Rapid Heat Dissipation
  • Includes a Large 3.50-inch Polished 304 Stainless Steel Tip
  • Includes Hangers and Hardware for an Easy Installation
  • Mandrel-bent 16-gauge Aluminized Steel Tubing
  • Dyno-tuned for Maximum Performance
  • Stainless Steel Heat Shield Clamps
  • Uses the Factory Hanger Locations
  • Aggressive Exterior Exhaust Tone
  • Easy Installation
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In stock items typically ship within 1-3 business days. Most items arrive within 2 business days, but there are situations where it may take up to 5 business days.

Special Order Items:
Special order and out of stock items are product-specific and lead times can vary. Please e-mail us if you are looking for an ETA / Lead Time on a specific product. Special order orders are subject to cancellation if the vendor cannot provide any ETA.

Returns Policy

To start the return process, please e-mail sales@allianceracing.com

Include the following:
Subject "Return for Order#"
Order Number
Part Number
Reason

Returns are eligible for up to 14 days from delivery of items. Accepted refunds can take up to 7-10 business days to process. All refunds are subject to a 25% restocking fee, if opened. Customer may be responsible for return shipping. If 14 days have gone by since your item was delivered, unfortunately we can’t guarantee you a refund or exchange. We reserve the right to deny any return request, based on provided information.

Alliance Racing is not responsible for ensuring part fitment. It is the responsibility of the purchaser to ensure the parts being ordered are the correct fitment for the vehicle intended. Alliance Racing will not accept any returns for incorrect fitment after product is opened.

To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

Shipping

To return your product, mail your product to:
Alliance Racing LLC
8810 Twin Lakes Blvd
Tampa, FL 33614

In many cases, you will be responsible for shipping costs to return your item. Shipping costs are non-refundable. If you receive a refund, the cost of shipping will be deducted from your refund.

Depending on your location, the time it may take for your exchanged product to reach you may vary.

If you are shipping an item over $100, you should consider using a trackable shipping service and/or purchasing Shipping Insurance.

To initiate a price match, please e-mail sales@allianceracing.com with the product information (SKU, URL, & Part Name) and a link to the competitors product page for us to validate the price match eligibility.

Please note that there are cases when we cannot offer a price match, but we will do everything in our power to try to match it. Some manufacturers have Pricing Policies that we have to adhere to.

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