A twin 3in stainless cat-back, the Exhaust Systems Australia FORD-MUSTANG-FM-5-0L-COYOTE-V8-GT-FASTBACK-COUPE-3-TWIN-STAINLESS-CAT-BACK-EXHAU is listed to fit the FM Mustang GT 5.0L Coyote V8 fastback coupe. The twin-pipe layout in 304 stainless is the headline: two 3in runs the length of the car, with mufflers, finished in the standard tip rather than a decorative tip option.
What does a twin 3in cat-back cover?
A cat-back replaces everything from the catalytic converters rearward, so the factory cats and emissions hardware stay put while the muffled section behind them is renewed. Running it as twin 3in matches the Coyote V8's two-bank layout, giving each side its own pipe back to the rear. With mufflers retained, it keeps a street-civil note rather than going straight-through.
Why 304 stainless for the FM Mustang?
The FM Mustang is a daily-able performance coupe, and a 304-stainless cat-back resists the corrosion and heat-bluing that dull a system over time — worthwhile under a car that's kept and seen. The material is the durability story here; the standard tip finish keeps it understated rather than chasing a show-tip look.
Is it road legal?
As a cat-back, this system fits behind the catalytic converters and leaves the factory cats in place — the emissions hardware that matters for road compliance. The supplier doesn't publish a compliance statement, so confirm the exact build and any NSW requirements with the workshop before fitting.
What does fitting involve at Oak Flats?
Oak Flats Muffler Men supplies and fits Mustang cat-backs in-house across the Illawarra. We check the twin-pipe routing over the rear subframe and confirm the mufflers and hangers sit cleanly. It's listed to fit the FM GT fastback; send your build and we'll book the bay. RRP is $1,950.
Stocked and fitted by Oak Flats Muffler Men, the Illawarra exhaust and 4x4 specialist in Oak Flats, NSW.
Common questions
Does this keep the catalytic converters?
Yes — it's a cat-back, fitting behind the factory cats, so the emissions hardware stays in place.
What tips does it come with?
This version runs the standard tip finish. If you want black chrome tips, ask about the black-chrome-tip version of this system.
Will it fit my FM Mustang GT?
It's listed to fit the FM Mustang GT 5.0L Coyote V8 fastback coupe. Confirm your exact build with Oak Flats Muffler Men before ordering.
Fitment support across the Illawarra
Fitment checks near you across 18 Illawarra suburbs, from Oak Flats and Shellharbour to Wollongong and Kiama.Show nearby fitment areasCollapse section
Oak Flats Muffler Men can check this part against supplier specs, part number, image, RRP and vehicle details for customers around Oak Flats, Shellharbour, Wollongong, Dapto, Albion Park, Kiama and the northern suburbs.
Send the vehicle make, model, year, engine, current issue, desired sound or performance goal, and clear photos of the existing exhaust where available.