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Vehicle Info NeededFLOWMASTERPART NUMBER: 389-817560
Outlaw Series Cat-Back Exhaust System 2011-2012 Ford Mustang GT/Shelby GT500 5.4L
$1,44995
Ships on Sep 03, 2026
Lowest Price GuaranteeFord
Outlaw Series Cat-Back Exhaust System2011-2012 Ford Mustang GT/Shelby GT500 5.4L 3" Tubing 4" Polished Stainless Steel Tips Dual Rear Exit 409S Stainless Steel
FLOWMASTER MUFFLERS 817560 Features:
Flowmaster® proudly introduces our newest cat-back exhaust system for 2011-2012 Mustang GT with the 5.0L engine. Designed for the hard core enthusiast, the Outlaw Series mufflers deliver a very aggressive exterior tone, along with an aggressive interior sound as well. The system features dual 3.00-inch mandrel-bent stainless steel tubing, our exclusive Scavenger Series® X-pipe for maximum power and a unique deep tone and includes a pair of our race-proven Outlaw® mufflers. The large 3.00-inch mandrel-bent tailpipes use the factory hanger locations are finished off with 4.00-inch polished 304 stainless steel tips. Includes all necessary parts, hardware and detailed instructions for an easy installation you can do at home. Covered by our Lifetime Limited Warranty. Note: Does Not Fit GT500.- Large 3.00-inch Mandrel-bent Tubing
- Uses the Factory Hanger Locations
- Dyno Proven Performance Gains
- Race-proven Outlaw Mufflers
- Stainless Steel Construction
- Lifetime Limited Warranty
- Super Aggressive Sound
Aggressive Race-Oriented Exhaust System
Flowmaster Outlaw Series Exhaust Systems feature race-bred components that ensure minimal flow restriction (slight sound reduction) over open exhaust tubing on vehicles without catalytic converters. With easy fit in mind, these systems are mandrel-bent for maximum performance and mount using stock hanger locations. Outlaw systems are dyno-tuned to improve throttle response, deliver an ultra-aggressive interior/exterior tone, and include all necessary parts and hardware for easy installation.
Part TypeExhaust System
Product LineFlowmaster Outlaw Series Exhaust Systems
BrandFLOWMASTER
Package Height12.0
Package Width25.0
Package Length52.0
Weight64.0 PG
Muffler Body Diameter4 in.
Tailpipe Diameter (In.)3
Muffler Inlet Inside Diameter3 in.
Hangers IncludedYes
Main Piping Diameter3 in.
Tail Pipe QuantityDual
Inlet TypeClamp-On
Tip CutSlant
Exhaust Tip Material304 Stainless Steel
Catalytic Converter Quantity0
Exit LocationSplit Rear
Inlet QuantityOne
Muffler Body Length10.50 in.
Sound LevelAggressive
Muffler MaterialStainless steel
Muffler Body Material409 Stainless Steel
Exhaust Tip CutAngled
Gasket Or Seal IncludedNo
Exhaust Tip IntercooledNo
Pipe ColorBlack
System FinishNatural
Muffler Quantity2
Exit QuantityTwo
Tip MaterialStainless steel
Muffler Flanged OutletNo
Tip QuantitySingle
Exhaust Tip ResonatedNo
Exhaust TypeDual
Catalytic Converter IncludedNo
Heat Shield IncludedNo
Part CategoryPerformance Parts
Hardware IncludedYes
Exhaust Tip WallSingle Wall
Exhaust Tip Quantity2
Exhaust Tip FinishPolished
Exhaust Tip EdgeRolled Edge Angle Cut
Valve IncludedNo
Muffler TypeChambered
Pipe Material409 Stainless Steel
Muffler Body Width4 in.
Tail Pipe Tapered OutletNo
Muffler Body ShapeRound
Mounting Bracket IncludedNo
Muffler Outlet Quantity1
Muffler FinishBlack High-Temperature Paint Finish
Inlet Diameter3 in.
Clamps IncludedYes
Muffler StyleSound attenuation rings
Tip Outlet Size4 in (101.6 mm)
FinishNatural
Exit StyleDual Out Rear
Muffler Body Height4 in.
Tip IncludedYes
Clamping TypeFlat Band
Muffler Flanged InletNo
Spring Bolt Kit IncludedNo
Muffler SeriesOutlaw
QuantitySold as a kit
Muffler IncludedYes
Exhaust Tip ConnectionWelded
System StyleCat Back
Tail Pipe Outlet Outside Diameter3 in.
Muffler ConfigurationDual inlet/Dual outlet
System MaterialStainless steel
Valve TypeNot Applicable
Tip Edge StyleRolled edge
Tip ShapeRound
Intermediate Pipe Diameter3 in (76.2 mm)
Exhaust Tip Diameter4 in.
Part FitmentDirect Fit
Vendor Part Number817560
Package Qty1
Package TypeEA
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