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  • Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System - 817940
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Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System - 817940
Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System - 817940
Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System - 817940
Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System - 817940
Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System - 817940
Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System - 817940
Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System - 817940
Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System - 817940
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Load image into Gallery viewer, Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System - 817940
Load image into Gallery viewer, Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System - 817940
Load image into Gallery viewer, Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System - 817940
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Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System - 817940

Exhaust, Mufflers & Tips Catback
Flowmaster
flo817940
In stock
Not CARB compliant. Not legal for sale or use in California on emissions-controlled vehicles.
$1,014.26 $1,181.95
This Flowmaster American Thunder dual exhaust system is specifically designed for 1967-1972 Chevrolet and GMC K10, K15/K1500, K20, and K25/K2500 4wd trucks with V8 engines. The system is perfect for the person looking for an aggressive to moderate interior and exterior sound level. Starting at the Crossmember-Back, the exhaust comes complete with a built-in H-pipe crossover for better exhaust scavenging, all mandrel-bent 2.50-inch stainless steel tubing, a pair of Super 44 Series performance mufflers, and your choice of three tailpipe exits (Turndown behind rear tires, side exit behind rear tires, or straight out the back under the bumper). The system includes all hardware necessary for installation and is covered by our Lifetime Limited Warranty. Fits both short and long wheelbase trucks. Manifold down pipes and header reducers not included. Fits both long and short bed trucks. Features & Benefits Crossmember-Back Design Works with Stock Manifolds or Headers, Allowing More Application Options Three Different Tailpipe Exit Options Allow You to Tailor the Look of the Kit to Your Style Super 44 Mufflers Deliver Increased Performance and an Aggressive to Moderate Sound Level Mandrel-Bent Pipes Help to Maximize the Exhaust Flow for Better Performance 16-Gauge, 2.50-Inch 409 Stainless Steel Pipes add Durability...
Flowmaster 21-25 Ford F150 2.7L/3.5L/5.0L American Thunder Cat-Back Exhaust System - 817979
Flowmaster 21-25 Ford F150 2.7L/3.5L/5.0L American Thunder Cat-Back Exhaust System - 817979
$1,181.95 $1,014.26
Flowmaster 18-25 Wrangler JL 2.0T Outlaw Extreme Cat-Back Exhaust System - 818109
Flowmaster 18-25 Wrangler JL 2.0T Outlaw Extreme Cat-Back Exhaust System - 818109
$506.95 $434.66
Flowmaster 67-72 GM Truck 4WD American Thunder Crossmember-Back Exhaust System - 817940
SKU: flo817940
Product Details

Everything You Need To Know

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

Product Info

This Flowmaster American Thunder dual exhaust system is specifically designed for 1967-1972 Chevrolet and GMC K10, K15/K1500, K20, and K25/K2500 4wd trucks with V8 engines. The system is perfect for the person looking for an aggressive to moderate interior and exterior sound level. Starting at the Crossmember-Back, the exhaust comes complete with a built-in H-pipe crossover for better exhaust scavenging, all mandrel-bent 2.50-inch stainless steel tubing, a pair of Super 44 Series performance mufflers, and your choice of three tailpipe exits (Turndown behind rear tires, side exit behind rear tires, or straight out the back under the bumper). The system includes all hardware necessary for installation and is covered by our Lifetime Limited Warranty. Fits both short and long wheelbase trucks.

Manifold down pipes and header reducers not included. Fits both long and short bed trucks.

Features & Benefits

  • Crossmember-Back Design Works with Stock Manifolds or Headers, Allowing More Application Options
  • Three Different Tailpipe Exit Options Allow You to Tailor the Look of the Kit to Your Style
  • Super 44 Mufflers Deliver Increased Performance and an Aggressive to Moderate Sound Level
  • Mandrel-Bent Pipes Help to Maximize the Exhaust Flow for Better Performance
  • 16-Gauge, 2.50-Inch 409 Stainless Steel Pipes add Durability and Strength
  • H-Pipe Style Crossover Helps Exhaust Gas Scavenging and Reduces Drone
  • Includes Hangers and Hardware for Installation
  • Lifetime Limited Warranty
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In Stock Items:
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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