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I also would like to know the actual top speed. Ive heard some people say 143mph an ive heard 153mph stock.
I can verify that the 4.6L V8 has a speed limiter built into the the stock tune for about 145mph with a 3.55 rear end (Mine limited at 142ish)... with a long enough road (like 5 miles straight, downhill, with a tailwind) and the software limiter raised, I would guess 150ish, maybe, 5th gear is so far into overdrive that there is just not a lot of torque left to overcome the aero drag.
The 3.7L v6 was said to be limited at 120. No idea on the ecoboost.
Will a stock 2006 mustang gt be able to keep up with the 2015 ecoboost mustangs?
The two are closely matched for HP & TQ, but the '06 GT is 150lb lighter and should beat an Ecoboost in a drag race. It should also beat a 3.7 V6 but keep in mind that the margin in both cases may only be about 0.2sec over a 1/4 mile so the driver will be the deciding factor.