I currently run a 2.0 injection pinto in my 7 and i am considering swapping it for a 4 age 20v. Would i see a great difference in performance?
It seems that both engines have a similar torque output.

I'd imagine the 4AGE is lighter and will rev more freely so you should see a little more go in it.

I would think you would see a difference. My stock 4age 20v is 150bhp 150 lbft. It delivers that very smoothly through modern management VVT and ITBs.

If I was on a track day and spotted a xflow I would expect to be beat xflows, as i would most zetecs.

I don't know if it is just the engine, the chassis or my excited driving, but my car seems to always punch well above its weight.