← Ford Mustang · 2015-2023 · S550

Ford Mustang S550

First IRS Mustang. GT350 flat-plane V8 is the cult pick.

Verdict
A
BHP
460 bhp
0–60
4.3 s
Top speed
163 mph
MPG
20.0 mpg
Used
$15,000-$70,000

Strengths

  • Independent rear suspension transformed it
  • GT350 5.2 flat-plane V8 is a future classic
  • Big Brembos standard on GT Performance
  • Fox-body parts community has aged in

Weaknesses

  • Heavy
  • Rear visibility
  • 10-speed auto can hunt
  • Interior still trails German rivals

Notable tech

  • First Mustang IRS as standard
  • MagneRide adaptive dampers
  • 10-speed automatic
  • Flat-plane crank V8 on GT350
  • Carbon fiber wheels on GT500

Common issues

  • Oil consumption on early 5.2 GT350 engines
  • MT-82 manual notchy / TSB-prone
  • Theta II oil pan leaks
  • EcoBoost coolant intrusion in some 2.3 cars

Used-market budget

$28,000

Typical price point for a well-maintained example with full service history. Cars priced significantly below this often require remedial work.