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  • Flowmaster 19-25 GM 1500 5.3L FLowFX Direct Fit Active Muffler - 717911
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Flowmaster 19-25 GM 1500 5.3L FLowFX Direct Fit Active Muffler - 717911
Flowmaster 19-25 GM 1500 5.3L FLowFX Direct Fit Active Muffler - 717911
Flowmaster 19-25 GM 1500 5.3L FLowFX Direct Fit Active Muffler - 717911
Flowmaster 19-25 GM 1500 5.3L FLowFX Direct Fit Active Muffler - 717911
Flowmaster 19-25 GM 1500 5.3L FLowFX Direct Fit Active Muffler - 717911
Flowmaster 19-25 GM 1500 5.3L FLowFX Direct Fit Active Muffler - 717911
Flowmaster 19-25 GM 1500 5.3L FLowFX Direct Fit Active Muffler - 717911
Flowmaster 19-25 GM 1500 5.3L FLowFX Direct Fit Active Muffler - 717911
Flowmaster 19-25 GM 1500 5.3L FLowFX Direct Fit Active Muffler - 717911
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Flowmaster 19-25 GM 1500 5.3L FLowFX Direct Fit Active Muffler - 717911

Exhaust, Mufflers & Tips Muffler
Flowmaster
flo717911
Special order
September 23, 2026
$965.96 $1,124.95
Introducing the new Flow FX® Active Dual-mode muffler featuring our new W.A.V.E. Technology™ (Wireless Active Valve Exhaust™) for all 2019-2026 GM Silverado/Sierra 1500 (new body style) with 5.3L engine. This direct-fit replacement muffler has split personalities with a nice performance tone over the stock exhaust system, thanks to the Flowmaster® Flow FX performance muffler. The system also features a high quality wireless controlled actuator valve on the Power Chamber® redirecting exhaust through the turn down, giving you that deep open exhaust sound with just a push of a button. System features include mandrel-bent stainless steel construction leading into the Power Chamber, followed by a round Flow FX performance muffler that easily connects to the factory tailpipe. The Power Chamber houses a wireless controlled valve with a large 3.00-inch turndown dump style tailpipe letting everyone know who the Boss is once activated. Other system features include actuator motor, control unit, two wireless key fobs, all necessary wiring, hardware, and detailed instructions. Maximum dyno gains of 9 hp and 11 lb.ft. at the rear wheels. Note: Fits 2019 (New body) 2/4 wheel drive and all wheelbases. Does Not Fit 2019 Classic Body. Features & Benefits Deep Performance Tone from "Straight-through" Flow FX...
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Flowmaster 19-25 GM 1500 5.3L FLowFX Direct Fit Active Muffler - 717911
SKU: flo717911
Product Details

Everything You Need To Know

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

Product Info

Introducing the new Flow FX® Active Dual-mode muffler featuring our new W.A.V.E. Technology™ (Wireless Active Valve Exhaust™) for all 2019-2026 GM Silverado/Sierra 1500 (new body style) with 5.3L engine. This direct-fit replacement muffler has split personalities with a nice performance tone over the stock exhaust system, thanks to the Flowmaster® Flow FX performance muffler. The system also features a high quality wireless controlled actuator valve on the Power Chamber® redirecting exhaust through the turn down, giving you that deep open exhaust sound with just a push of a button. System features include mandrel-bent stainless steel construction leading into the Power Chamber, followed by a round Flow FX performance muffler that easily connects to the factory tailpipe. The Power Chamber houses a wireless controlled valve with a large 3.00-inch turndown dump style tailpipe letting everyone know who the Boss is once activated. Other system features include actuator motor, control unit, two wireless key fobs, all necessary wiring, hardware, and detailed instructions. Maximum dyno gains of 9 hp and 11 lb.ft. at the rear wheels. Note: Fits 2019 (New body) 2/4 wheel drive and all wheelbases.

Does Not Fit 2019 Classic Body.

Features & Benefits

  • Deep Performance Tone from "Straight-through" Flow FX Muffler
  • Max Dyno Gains of 9 hp and 11 lb.ft. of Torque
  • Features Flowmasters W.A.V.E. Technology
  • Very Aggressive Active By-Pass Sound
  • Mandrel-bent Stainless Steel Tubing
  • Detailed Installation Instructions
  • Wireless Controlled Actuator Motor
  • Direct-fit Replacement Muffler
  • Includes a High Quality Valve
  • Stainless Steel Construction
  • Includes Two Key Fobs

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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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