The 2015 Ford Mustang V8 has been improved from lessons learnt developing the special edition 2013 Ford Mustang Boss 302.

The alterations include:

• Larger intake valves
• Larger exhaust valves
• Revised intake camshafts
• Revised exhaust camshafts
• Stiffer valve springs
• Improved cylinder head ports
• Larger valves
• Lighter and more durable rods
• Rebalanced forged crankshaft

Along with the internal changes, the intake manifold has been adapted to allow for partially closed port flow at lower engine speeds. This will improve air-fuel mixture and economy, idle stability and emissions.

These changes should bring around 420 horsepower and 390 lb.-ft of torque, a similar rating to the 2013-2014 Ford Mustang GT.