They make a ton of power, the latest Whipple tunes are making 750-760rwhp at 12-13psi with 93 octane all stock engine of course... its pretty nuts.
But believe it or not, I have found that the 2015 Mustang IRS is MUCH worse than the Z at putting down the power. I have had to replace tons of stuff back there and I have more boxes of parts I have to swap in as its still not very good yet. Everything bends and flexes so much from the torque that its killing my rear tires every 2500 miles due to how far out of wack the alignment goes during full throttle.
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