I wouldn't sweat it. After I put my prochamber on, I noticed it smoked quite a bit also. It's not as bad as when it first went on, but it pretty much doing the same thing you described. There are no leaks - I've checked and had it checked by someone else just to be sure - and the engine runs fine. My dyno results after the install are in my signature. I also gained 3 mph on my trap speed. I think the extra smoke has a lot to do with the fact that the cats are gone.