I have DD Stage 2 injectors and I am very happy with them. Clean running, excellent mileage, no smoke even at 6000 ft. taking off here in Albu. unless I go wild with the DD True Torque box (#4). Then at altitude i can get a puff, nothing more. No smoke under power after that initial take-off. I am running the Jammer turbo from DD and it spools just a tiny bit slower than stock, contributing to the ability to make a brief, initial puff of smoke. Nothing like Ol' Sickly the 12 valve could do for smoke! It's amazing how much power the 3rd gens can make without smoke bringing the smog nazis around in a feeding frenzy.
Before worrying about a cam, I plan to get the new ball bearing turbo that DD has almost finished.