I REALLY wouldn't suggest using the PGF2a in the stomach. Yes, I've known a few guys who have done it. No... I wouldn't do it anyway.
I lost an entire shitload of fat on it. Injected bi's, tri's, and delts. It's gonna burn fat anyway... so you may as well grow at the same time.
But the growth isn't all that drastic... and the sides don't really warrant the use.
I burned off almost as much fat, and gained quite a bit more muscle on a run of Fina as I did with the PGF2a. In my opinion, it just isn't worth it.