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817799 - Flowmaster American Thunder Cat-back Exhaust System - default Image
817799 - Flowmaster American Thunder Cat-back Exhaust System - additional Image
817799 - Flowmaster American Thunder Cat-back Exhaust System - additional Image
817799 - Flowmaster American Thunder Cat-back Exhaust System - additional Image
817799 - Flowmaster American Thunder Cat-back Exhaust System - additional Image
817799 - Flowmaster American Thunder Cat-back Exhaust System - additional Image
817799 - Flowmaster American Thunder Cat-back Exhaust System - additional Image
2018-19 Mustang GT 5.0L Active Exhaust - American Thunder Axle-back Exhaust 817799YouTube Button

Flowmaster American Thunder Cat-back Exhaust System

2018-2019 Ford Mustang GT 5.0L engine and Factory Active Performance Exhaust Option.

PART# 817799

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Fits 2018-2019 Ford Mustang GT 5.0L engine and the Active Performance Exhaust Option. Fits both coupes and convertibles

Overview

The new Flowmaster® American Thunder® Axle-back exhaust system is for 2018-2019 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

Specs

BrandFlowmaster
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Catalytic Converter IncludedNo
Emission Code5
Exhaust SeriesAmerican Thunder
Exit PositionDOR
Heat ShieldNo
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 Systems / Kits
Single DualDual
Sound LevelModerate/Aggressive
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
Tip StyleDouble Wall
Tubing Diameter (in)3
Tubing Material409S Stainless Steel
Part Number817799

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.

Tech Resources

Fits 2018-2019 Ford Mustang GT 5.0L engine and the Active Performance Exhaust Option. Fits both coupes and convertibles

Applications

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