Some of you people wouldn't be happy with 350 HP....or 400 HP....or 500 HP. And if you were, you'd find something else to complain about - mainly because you are trolling a Ford Forum looking for flame bait.
When was the last time Mustang GT had an engine option? Come on...I'm sure one of you really smart folks knows.
300 HP is a logical, evolutionary step up from 260 HP (99-04), which was a logical step up from 215-225 HP (94-98), etc. The Cobra or other Special Edition will have an evolutionary increase in power also.
Those that wish to compare it to the LS1 or even LT1 F-body can do so all they wish. The 3V is somewhat more powerful than the LT1, somewhat less powerful than the LS1. That's life - if you can't deal with it, I suggest finding a used, low-mileage LS1 F-body for yourself. You'll be happier. I would also suggest that
www.ls1.com might be a better place for you to troll, if you catch my drift.
BTW - right now, Mustang has no direct competitor. There is nothing in its target market. The 05 GTO is close, but it is a step up in most categories (certainly in price).
The Jag is in a way different class than anything that says "Mustang", and thus it should come as no surprise at all that the drivetrains might not be the same.
ThunderRoad....agree 100%.
Klay...there were issues with the 99 Cobra DOHC engines - mostly, they were just over-rated as delivered. Beyond that, and so long as you don't try and boost them (at least not much), the 4.6 holds up pretty well to abuse.