Our Picks

All four of these manifolds serve their purpose in the performance community. The GT manifold is probably best suited for road race and autocross cars looking for the power coming off the corners. If all-out high horsepower for drag racing is your thing, then stick with the Cobra Jet manifold. The BOSS 302 is a cost effective upgrade as a mid-level upgrade for the 2011-14 GTs and the GT350 respectively for the 2015+ GTs.

GT

• 1 hp at 6,900 rpm
• 2 lb-ft at 5,400 rpm
• Average Power: 373 hp, 376 lb-ft – 2,800-7,500 rpm

BOSS 302

• 4 hp at 7,600 rpm
• 4 lb-ft 5,400 rpm
• Average Power: 376 hp, 361 lb-ft – 3,000-7,800 rpm
• +/- to GT manifold:+19.3 hp, -30.8 lb-ft

Cobra Jet

• 2 hp at 7,600 rpm
• 6 lb-ft at 5,400 rpm
• Average Power: 386 hp, 370 lb-ft – 3,000-7,800 rpm
• +/- to GT manifold:+40.1 hp, -20.6 lb-ft

GT350

• 8 hp 7,500 rpm
• 6 hp 6,100 rpm
• Average Power: 381 hp, 365 lb-ft – 3,000-7,800 rpm
• +/- to GT manifold:+24.7 hp, -26.6 lb-ft

More OEM Goodness from Ford Performance

When we asked what’s in store for 2015+ 5.0 enthusiasts, Kershaw remarked, “We are really close to releasing our Power Upgrade kits for the 2015-2016 Mustang GT and Power Upgrade 3 that includes the GT350 manifold. This is the first time we’ve offered one of our manifolds with a CARB EO. You can now rev over 7,000 rpm and it picks up huge of the stock manifold, nearly 70 hp at 7,500 rpm!  However, it loses some mid-range and is pricy. The Power Upgrade 2 uses the GT350 throttle body and CAI picks up 21 hp peak, over 40 lb-ft at 1,500 rpm and will be a very reasonably priced.”