Skip to main content
ASK OUR EXPERTS
1-866-464-6553

Flowmaster American Thunder Axle-back Exhaust System

Fits 2018-2023 Mustang GT 5.0L with Factory Active Performance Exhaust Valves. - Aggressive to moderate sound

Part # 817799 Be the first to write a review

Flowmaster American Thunder Axle-back Exhaust System

In Stock
Free Shipping - Lower 48 US States
$1,615.95
Add to Wishlist
Starting at $143 a month with Learn More
Delta Flow
5

Emissions

This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

See Emissions Details
This Flowmaster® American Thunder® Axle-back exhaust system is for 2018-2023 Ford Mustang GT coupes and convertibles with the 5.0L engine and Factory Active Performance Exhaust Option. System features include a pair of specially designed Outlaw® series mufflers giving you high flow with a moderately aggressive exterior and interior tone when the valves are closed, and an aggressive "wide open" exterior sound level when you open up the valves. Other features include large 3.00-inch mandrel-bent 409S stainless steel tubing for high flow, durability, and longevity. Add to that, a pair of our high-quality valves to accommodate the factory exhaust actuators for when you really want to open up the sound. The system is finished off with quad 4.00-inch polished 304 stainless steel tips for an aggressive look that demands attention, the same as the exhaust note. Includes all necessary parts, hardware and detailed instructions for an easy installation you can do at home. Covered by our Lifetime Limited Warranty. Note: Fits both coupes and convertibles.

Features:

  • Quad 4.00-inch Polished 304 Stainless Steel Tips
  • For Vehicles With Active Performance Exhaust Option
  • Aggressive Race-proven Outlaw Mufflers
  • Dyno Tuned for Maximum Performance
  • Uses the Factory Hanger Locations
  • Full Stainless Steel Construction
  • Straight-through Muffler Design
  • Lifetime Limited Warranty
  • Easy Installation

About Flowmaster

Shop the official site of Flowmaster for exhaust systems, mufflers, and more that deliver the iconic Flowmaster sound. Available at Holley.com!

Brand Flowmaster
Catalytic Converter IncludedNo
Emission Code5
Exhaust SeriesAmerican Thunder
Exit PositionDual Out Rear
Heat ShieldNo
Material409 Stainless Steel
Mount TypeUses Factory Hangers
Muffler Body Length (in)11
Muffler ColorBlack
Muffler FinishPainted
Muffler Inlet Diameter (in)3
Muffler Inlet LocationSide
Muffler Material409S Stainless Steel
Muffler Outlet Diameter (in)3
Muffler Outlet LocationDual
Muffler Overall Length (in)49.5
Muffler Part NumberKit Only
Muffler Quantity2
Muffler Series60 Series
Muffler ShapeOval
Muffler TypeReflection
Product TypeExhaust System
Single DualDual
Sound LevelAggressive / Moderate
System TypeAxle-back
Tip CutAngle
Tip Diameter (in)4
Tip Edge StyleCut
Tip FinishPolished
Tip Length (in)5.25
Tip LogoEmbossed
Tip Material304 Stainless
Tip Quantity4
Tip ShapeRound
Tubing Diameter (in)3
Tubing Material409S Stainless Steel
UPC700042037766
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number817799
5

This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.
Fits 2018-2023 Mustang GT 5.0L Coupes & Convertibles with Factory Active Performance Exhaust Valves.
Reviews

    Your Review

    *Free Shipping & Handling only offered to the contiguous US on orders over $149, excludes clearance parts and oversized packages.

    Some parts are not legal for use in California or other states with similar regulations.