While not a new mustang, I had a 3+ in a 340 dart, I have a 2+ in a blown barracuda, and a 2+ hybrid in the mustang... I prefer the 2+ all the way around for a street/strip and while I am building a bigger motor for the barracuda, a 2+ hybrid is going in that as well. Can't beat the smoothness of it, and it has held everything I have thrown at it so far.