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  • Flowmaster 68-70 Mopar B-BODY 2.50in. American Thunder SS Exhaust System - 817390
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Flowmaster 68-70 Mopar B-BODY 2.50in. American Thunder SS Exhaust System - 817390
Flowmaster 68-70 Mopar B-BODY 2.50in. American Thunder SS Exhaust System - 817390
Flowmaster 68-70 Mopar B-BODY 2.50in. American Thunder SS Exhaust System - 817390
Flowmaster 68-70 Mopar B-BODY 2.50in. American Thunder SS Exhaust System - 817390
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Flowmaster 68-70 Mopar B-BODY 2.50in. American Thunder SS Exhaust System - 817390

Exhaust, Mufflers & Tips Catback
Flowmaster
flo817390
Special order
September 23, 2026
Not CARB compliant. Not legal for sale or use in California on emissions-controlled vehicles.
$1,002.80 $1,257.95
The American Thunder system is for the person who is looking for a complete Crossmember-Back dual exhaust system with a deep powerful sound. The system is constructed from 2.50-inch mandrel-bent stainless steel tubing and includes an H-pipe to balance the exhaust pulses and to eliminate back-rap on deceleration. The large cased Super 40 Series performance mufflers generally deliver a moderate interior tone with a deep powerful exterior sound which is suited for enthusiasts who want their performance to be heard. The mandrel-bent tailpipes exit straight out the back under the rear bumper for a strong muscular appearance and allows you to select your own style of tips. Designed for an easy fit, these systems include all necessary parts and hardware for easy installation and is covered by our Lifetime Limited Warranty. . Does Not include header reducer cones or downpipes for factor manifolds. Features & Benefits Does Not Include Header Reducers or Downpipes for Factory Manifolds H-pipe Crossover for Maximum Power and Deep Tone Super 40 Series Mufflers for Deep Powerful Sound Includes Hangers and Hardware for Installation Mandrel-bent 16-gauge Stainless Steel Tubing Moderate to Aggressive Exterior Exhaust Tone Crossmember-Back True Dual Exhaust System Lifetime Limited Warranty
Flowmaster 87-96 Ford F150 American Thunder SS Cat-Back Exhaust System - 817471
Flowmaster 87-96 Ford F150 American Thunder SS Cat-Back Exhaust System - 817471
$1,257.95 $1,002.80
Flowmaster 05-12 Tacoma 4.0L American Thunder SS Cat-Back Exhaust System - 817432
Flowmaster 05-12 Tacoma 4.0L American Thunder SS Cat-Back Exhaust System - 817432
$1,012.95 $807.26
Flowmaster 68-70 Mopar B-BODY 2.50in. American Thunder SS Exhaust System - 817390
SKU: flo817390
Product Details

Everything You Need To Know

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

Product Info

The American Thunder system is for the person who is looking for a complete Crossmember-Back dual exhaust system with a deep powerful sound. The system is constructed from 2.50-inch mandrel-bent stainless steel tubing and includes an H-pipe to balance the exhaust pulses and to eliminate back-rap on deceleration. The large cased Super 40 Series performance mufflers generally deliver a moderate interior tone with a deep powerful exterior sound which is suited for enthusiasts who want their performance to be heard. The mandrel-bent tailpipes exit straight out the back under the rear bumper for a strong muscular appearance and allows you to select your own style of tips. Designed for an easy fit, these systems include all necessary parts and hardware for easy installation and is covered by our Lifetime Limited Warranty. .

Does Not include header reducer cones or downpipes for factor manifolds.

Features & Benefits

  • Does Not Include Header Reducers or Downpipes for Factory Manifolds
  • H-pipe Crossover for Maximum Power and Deep Tone
  • Super 40 Series Mufflers for Deep Powerful Sound
  • Includes Hangers and Hardware for Installation
  • Mandrel-bent 16-gauge Stainless Steel Tubing
  • Moderate to Aggressive Exterior Exhaust Tone
  • Crossmember-Back True Dual Exhaust System
  • Lifetime Limited Warranty
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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.

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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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