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  • Flowmaster 68-74 Chevrolet Nova 2.5in. SS American Thunder Crossmember-Back Exhaust System - 817158
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Flowmaster 68-74 Chevrolet Nova 2.5in. SS American Thunder Crossmember-Back Exhaust System - 817158
Flowmaster 68-74 Chevrolet Nova 2.5in. SS American Thunder Crossmember-Back Exhaust System - 817158
Flowmaster 68-74 Chevrolet Nova 2.5in. SS American Thunder Crossmember-Back Exhaust System - 817158
Flowmaster 68-74 Chevrolet Nova 2.5in. SS American Thunder Crossmember-Back Exhaust System - 817158
Flowmaster 68-74 Chevrolet Nova 2.5in. SS American Thunder Crossmember-Back Exhaust System - 817158
Flowmaster 68-74 Chevrolet Nova 2.5in. SS American Thunder Crossmember-Back Exhaust System - 817158
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Load image into Gallery viewer, Flowmaster 68-74 Chevrolet Nova 2.5in. SS American Thunder Crossmember-Back Exhaust System - 817158
Load image into Gallery viewer, Flowmaster 68-74 Chevrolet Nova 2.5in. SS American Thunder Crossmember-Back Exhaust System - 817158
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Flowmaster 68-74 Chevrolet Nova 2.5in. SS American Thunder Crossmember-Back Exhaust System - 817158

Exhaust, Mufflers & Tips Catback
Flowmaster
flo817158
Special order
September 23, 2026
Not CARB compliant. Not legal for sale or use in California on emissions-controlled vehicles.
$852.11 $1,068.95
For the person who is looking for a true dual Crossmember-Back exhaust system with an moderate to aggressive exhaust tone. With an easy fit in mind, these systems are constructed from 16-gauge 2.50-inch mandrel-bent stainless steel tubing with a built-in H-pipe crossover, a pair of specially selected Super 44 Series performance mufflers and includes all hangers and hardware necessary for installation. The tailpipes exit in the factory location behind the rear wheels. The exhaust system delivers an aggressive to moderate exterior sound tone with a moderate interior tone and is best suited for the enthusiast who wants their performance to be heard. Like all Flowmaster exhaust systems, the benefits include improved throttle response, power and mileage. Covered by our Lifetime Limited Warranty. Fits 1968-1974 Chevrolet Nova with V8 engine. Features & Benefits Does Not Include Header Reducer Cones or Downpipes for Factory Manifolds Super 44 Series Performance Mufflers for Deep Powerful Sound Crossmember-Back True Dual 2.50-inch Exhaust System Includes Hangers and Hardware for Installation Mandrel-bent 16-gauge Stainless Steel Tubing Aggressive to Moderate Exterior Exhaust Tone H-pipe Crossover for Maximum Power Lifetime Limited Warranty
Flowmaster 64-67 GM A-BODY 3in. American Thunder SS Crossmember-Back Exhaust System - 817202
Flowmaster 64-67 GM A-BODY 3in. American Thunder SS Crossmember-Back Exhaust System - 817202
$1,462.95 $1,166.06
Flowmaster 2.50in. Universal X-Pipe Kit - 815953
Flowmaster 2.50in. Universal X-Pipe Kit - 815953
$133.95 $106.70
Flowmaster 68-74 Chevrolet Nova 2.5in. SS American Thunder Crossmember-Back Exhaust System - 817158
SKU: flo817158
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 is looking for a true dual Crossmember-Back exhaust system with an moderate to aggressive exhaust tone. With an easy fit in mind, these systems are constructed from 16-gauge 2.50-inch mandrel-bent stainless steel tubing with a built-in H-pipe crossover, a pair of specially selected Super 44 Series performance mufflers and includes all hangers and hardware necessary for installation. The tailpipes exit in the factory location behind the rear wheels. The exhaust system delivers an aggressive to moderate exterior sound tone with a moderate interior tone and is best suited for the enthusiast who wants their performance to be heard. Like all Flowmaster exhaust systems, the benefits include improved throttle response, power and mileage. Covered by our Lifetime Limited Warranty.

Fits 1968-1974 Chevrolet Nova with V8 engine.

Features & Benefits

  • Does Not Include Header Reducer Cones or Downpipes for Factory Manifolds
  • Super 44 Series Performance Mufflers for Deep Powerful Sound
  • Crossmember-Back True Dual 2.50-inch Exhaust System
  • Includes Hangers and Hardware for Installation
  • Mandrel-bent 16-gauge Stainless Steel Tubing
  • Aggressive to Moderate Exterior Exhaust Tone
  • H-pipe Crossover for Maximum Power
  • Lifetime Limited Warranty
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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.

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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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